Roborock QR 798 vs S8 MaxV Ultra: Which Premium Robot Vacuum Should You Buy?

Robot vacuums have transformed from novelty gadgets into essential home appliances, and the premium segment now offers automation levels that seemed impossible just a few years ago. Today's high-end models don't just vacuum—they mop, empty themselves, wash their own cleaning pads, and navigate your home with smartphone-like intelligence.

The two models we're examining, the Roborock QR 798 and S8 MaxV Ultra, both represent the pinnacle of Roborock's engineering, but they take notably different approaches to solving the same fundamental problem: keeping your floors spotless with minimal effort from you.

The Premium Robot Vacuum Landscape

Before diving into these specific models, it's worth understanding what separates premium robot vacuums from their budget counterparts. The key differentiators include suction power (measured in Pascals or "Pa"), sophisticated navigation systems using LiDAR (Light Detection and Ranging—essentially laser-based mapping), and comprehensive self-maintenance docks that can empty dust bins, wash mop pads, and refill water tanks automatically.

Both the QR 798 and S8 MaxV Ultra feature 10,000 Pa of suction power, which puts them among the most powerful consumer robot vacuums available at the time of writing. For context, entry-level models typically offer 2,000-3,000 Pa, while mid-range units usually cap out around 5,000-6,000 Pa.

The release timeline is important here: the S8 MaxV Ultra arrived in 2024 as Roborock's flagship, incorporating lessons learned from earlier models and pushing the boundaries of what's possible with robot vacuum technology. The QR 798, while also relatively recent, focuses more on refining proven technologies rather than introducing cutting-edge features.

Performance Deep Dive: Where the Rubber Meets the Road

Vacuuming: The Core Mission

When it comes to pure vacuuming performance, both models excel but use different approaches to achieve their results. The S8 MaxV Ultra employs what Roborock calls the DuoRoller Riser system—two counter-rotating rubber brushes that work together to lift debris and direct it toward the suction inlet. This dual-brush approach is particularly effective on carpets, where the opposing rotation helps agitate fibers and extract embedded dirt.

The QR 798 takes a more straightforward approach with a single all-rubber anti-tangle main brush, but this simplicity comes with advantages. The brush design is specifically engineered to minimize hair wrapping, a common frustration for robot vacuum owners, especially those with pets or long-haired family members. The side brush on the QR 798 even carries SGS certification claiming zero percent hair tangling—a bold claim that addresses one of the most common maintenance headaches.

In terms of raw pickup performance, user reviews and testing data suggest both models perform exceptionally well on hard floors, with pickup rates exceeding 90% for most debris types. On carpets, the S8 MaxV Ultra appears to have a slight edge, particularly in corners and along edges where its FlexiArm side brush technology makes a measurable difference.

The FlexiArm system deserves special attention because it represents a significant engineering advancement. Traditional robot vacuum side brushes are fixed in position, leaving gaps in coverage near walls and in corners. The S8 MaxV Ultra's side brush can extend outward dynamically, reaching into spaces that would otherwise require manual cleaning. Based on our research into user experiences, this feature consistently receives praise from owners who notice cleaner baseboards and corner areas.

Mopping: Beyond Basic Floor Wiping

Both models include comprehensive mopping systems, but their approaches differ significantly in sophistication and automation level. The QR 798 uses dual spinning mops rotating at 200 RPM, which provides consistent scrubbing action across floor surfaces. The mop lift capability of 10mm ensures carpets stay dry, and the 30-level water flow control allows users to customize moisture levels for different floor types.

The S8 MaxV Ultra elevates mopping to another level entirely with its VibraRise 3.0 system. Instead of simple rotation, these mop pads vibrate at up to 4,000 times per minute while also rotating, creating a scrubbing action that's particularly effective on dried-on spills and stubborn stains. The 20mm mop lift capability—double that of the QR 798—virtually eliminates the risk of accidentally wetting carpets or rugs.

Perhaps more impressive is the S8 MaxV Ultra's Extra Edge Mopping System, which includes a small secondary mop that swings out to clean right up to walls and into corners. This addresses a common limitation of round robot vacuums, which naturally leave small untouched areas along walls due to their circular shape.

The dock systems reveal another significant difference. Both models automatically wash their mop pads, but the S8 MaxV Ultra uses hot water for this process, which is demonstrably more effective at removing oils, sticky residues, and bacteria. The heated air drying system also prevents the mildew odors that can develop with standard air-drying systems.

Navigation and Intelligence: The Brain Behind the Operation

Navigation technology separates good robot vacuums from great ones, and both models excel here, though with different philosophies. The QR 798 relies on proven PreciSense LiDAR technology, which uses laser beams to map your home with millimeter precision. This system creates detailed floor plans, enables efficient cleaning patterns, and supports multi-floor mapping for homes with multiple levels.

The S8 MaxV Ultra builds on similar LiDAR foundations but adds Reactive AI 2.0 obstacle avoidance, which incorporates both an RGB camera and 3D structured light sensors. This combination allows the robot to recognize and avoid up to 73 different object types, including pet waste, shoes, cables, and furniture legs. The camera isn't just for obstacle avoidance—it enables unique features like remote video calling and pet monitoring, effectively turning your robot vacuum into a mobile security camera.

This camera system does raise privacy considerations that some users may find concerning. The QR 798 avoids these issues entirely with its non-camera approach, which may appeal to privacy-conscious households or those who simply prefer fewer connected devices with recording capabilities.

Based on user feedback and expert reviews, both navigation systems perform excellently in real-world conditions. The S8 MaxV Ultra tends to get stuck less frequently due to its advanced object recognition, while the QR 798 offers more predictable, consistent behavior that some users prefer.

The Dock Systems: Where Automation Happens

The self-maintenance capabilities of modern robot vacuum docks represent perhaps the biggest advancement in the category over the past few years. Both models offer comprehensive automation, but with varying levels of sophistication.

The QR 798 dock handles all the essential tasks: automatic dust emptying, mop washing and drying, and water tank refilling. The 2.7L dust bag capacity means most households can go weeks between bag changes. The dock features a detachable base design that makes cleaning and maintenance more manageable than fixed systems.

The S8 MaxV Ultra takes automation further with several premium features. The hot water mop washing system we mentioned earlier is complemented by automatic detergent dispensing from a substantial 580ml tank, which can last over three months of regular use. The dock also includes intelligent dirt detection—sensors that analyze the dirty water and automatically trigger additional wash cycles if the mops aren't completely clean.

The DirTect technology in the S8 MaxV Ultra dock deserves special mention because it represents a genuinely smart approach to cleanliness. If the sensors detect that the wash water is still dirty after a standard cleaning cycle, the system automatically runs additional cycles until the water runs clear. This kind of adaptive behavior shows how far automation has progressed beyond simple timer-based systems.

Value Proposition and Pricing Context

At the time of writing, both models command premium prices that reflect their advanced capabilities, but they occupy slightly different value positions within the high-end market. The QR 798 typically retails for somewhat less than the S8 MaxV Ultra, making it the more accessible option for buyers who want premium performance without cutting-edge features they may not use.

The S8 MaxV Ultra justifies its higher price point with features like the RGB camera system, advanced AI recognition, hot water dock cleaning, and the comprehensive edge cleaning systems. Whether these features provide sufficient value depends largely on your specific needs and budget.

For context, both models cost significantly more than mid-range alternatives, but they also eliminate virtually all manual maintenance while providing cleaning performance that matches or exceeds traditional vacuum cleaners in most scenarios. When evaluating value, consider the time savings from reduced manual cleaning and maintenance, which for many households justifies the premium pricing.

Unique Technical Features That Matter

Several technical innovations distinguish these models from competitors and from each other. The QR 798's anti-tangle brush system uses a specific rubber compound and brush geometry that genuinely reduces hair wrapping compared to bristle brushes or even other rubber designs. This matters most for households with pets or long-haired residents, where brush maintenance can become a weekly chore with less advanced systems.

The S8 MaxV Ultra's voice assistant feature, "Hello Rocky," represents the first built-in voice control system in a robot vacuum. This allows basic control commands even when Wi-Fi is unavailable, which can be surprisingly useful during internet outages or in areas with poor connectivity.

The ultrasonic carpet detection in both models automatically adjusts cleaning modes when transitioning between hard floors and carpets, but the implementation differs. The S8 MaxV Ultra can remember specific carpet preferences and adjust its behavior accordingly, while the QR 798 uses more standardized responses.

Home Theater Considerations

For home theater enthusiasts, noise levels during operation become particularly important. The QR 798 operates at approximately 55 dB during normal cleaning, which is quiet enough to run during movie watching without significant distraction. The S8 MaxV Ultra runs slightly louder at around 63 dB, though both are considerably quieter than traditional upright vacuums.

The scheduling capabilities of both models allow you to optimize cleaning times around entertainment use. Both support detailed room-by-room scheduling, so you could, for example, have the robot clean the home theater area before evening movie sessions while avoiding the space during prime viewing hours.

Performance Metrics That Actually Matter

When evaluating robot vacuum performance, several metrics deserve special attention. Debris pickup percentage on different surface types provides the clearest measure of cleaning effectiveness. Based on available testing data, both models achieve excellent pickup rates on hard floors (typically 90%+ for most debris types) and good performance on carpets, with the S8 MaxV Ultra showing slight advantages in edge cleaning scenarios.

Coverage percentage—how much of the available floor area the robot actually cleans—varies significantly between models and directly impacts real-world cleanliness. Both models achieve near-complete coverage in most room layouts, but the S8 MaxV Ultra's advanced navigation and edge-cleaning systems typically result in higher coverage percentages, especially in challenging areas like furniture clusters or rooms with complex layouts.

Runtime and battery efficiency matter less than they once did, since both models return to their docks automatically for recharging. However, the 180-minute runtime of both units means they can clean large homes (up to 300+ square meters) in a single session, which improves efficiency by reducing the number of cleaning cycles required.

Who Should Choose Which Model?

The decision between the QR 798 and S8 MaxV Ultra ultimately comes down to priorities and preferences rather than dramatic performance differences.

Choose the QR 798 if you prioritize reliability, simplicity, and proven technology. This model makes sense for households that want excellent cleaning performance without the complexity of advanced AI features. It's particularly well-suited for homes with significant pet hair challenges, thanks to its superior anti-tangle brush design. The lower price point and reduced complexity also make it attractive for users who want premium features without paying for cutting-edge technology they may not utilize.

The S8 MaxV Ultra is the clear choice for technology enthusiasts who want the most advanced features available. The camera-based obstacle avoidance, pet monitoring capabilities, and superior edge cleaning justify the premium for users who will actually utilize these features. It's also the better choice for homes with complex layouts or challenging cleaning scenarios where the advanced navigation and recognition systems provide tangible benefits.

Pet owners represent an interesting case study, as both models offer advantages. The QR 798 handles pet hair more effectively, while the S8 MaxV Ultra can avoid pet waste and provides remote monitoring capabilities. Your choice should depend on whether hair management or waste avoidance is your primary concern.

The Bottom Line

Both the Roborock QR 798 and S8 MaxV Ultra represent excellent examples of premium robot vacuum engineering, but they serve different user profiles within the high-end market. The QR 798 delivers outstanding cleaning performance with proven, reliable technology at a more accessible price point. The S8 MaxV Ultra pushes the boundaries of what's possible with current technology, offering features that genuinely improve the user experience for those who value cutting-edge innovation.

Neither model will disappoint in terms of basic cleaning performance, which means your decision can focus on features, budget, and personal preferences regarding technology complexity. Both represent significant improvements over robot vacuums from even a few years ago, and either will likely provide years of reliable, largely autonomous floor cleaning that will change how you think about home maintenance.

Roborock QR 798 Robot Vacuum and Mop Deals and Prices

Roborock S8 MaxV Ultra Robot Vacuum and Mop Deals and Prices