Roborock S8 Pro Ultra

A sonic pad that scrubs instead of wiping

The VibraRise 2.0 mop is what keeps the S8 Pro Ultra in the lineup. Rather than rotating pads it vibrates a single rectangular pad thousands of times a minute, which behaves more like scrubbing than wiping. Vacuum Wars put it through the same dried-on coffee, syrup and ketchup tests it uses across the category and reported that 'it delivered some of the best results we've seen so far,' crediting the vibration with loosening baked-on residue that spinning pads only smear around.

It also orients the pad to follow the direction of hardwood plank seams, which Vacuum Wars called a genuine differentiator: 'The S8 is the only robot vacuum we know of that has this feature.' On wide-plank engineered hardwood the reduced streaking is visible; on tile or vinyl plank it is not. The cost of a rectangular pad is reach — it cannot extend to baseboards the way a FlexiArm spinning pad can, so a narrow unmopped strip is left along walls.

6,000 Pa was flagship suction in 2023

RTINGS rates the S8 Pro Ultra's bare-floor debris pickup as good, noting it handles a wide variety of debris in a single pass on wide-open surfaces but struggles with debris piled in corners and along walls, and calls carpet pickup only decent — it 'struggles a little with fine debris' and leaves fine material embedded deep in carpet fibers. Those rubber rollers do resist hair tangle well, which matters in a long-haired-pet household where bristle rollers become wrapped tubes within a few cycles.

The mop pad lifts 5 mm to clear carpet, less than the 12 mm on the Eufy X10 Pro Omni or the 10.5 mm on the Dreame L40 Ultra, so a medium-pile rug can pick up a damp track. If half your floor area or more is carpet, the mop advantage does not pay for the vacuum compromise.

Structured light, and what happens in the dark

Obstacle avoidance uses structured light and infrared, and it holds up: Vacuum Wars watched it sidestep cables, socks, shoes and solid pet waste in its standard gauntlet. The catch is lighting. In a nearly dark room the projector loses contrast and the robot will occasionally drive over thinner objects; later Roborock models added camera-based avoidance to fix that and this one did not get the upgrade. Mapping is spinning LiDAR with three saved floors, and the app keeps per-room suction, water flow and mop settings between cycles.

The dock does everything except heat the water

After each cycle the RockDock Ultra empties the bin into a bagged compartment, washes the mop pad, drains dirty water into a separate tank and dries the pad with warm air, which is what prevents the mildew smell that ruins cheaper self-wash docks. What it does not do is wash with hot water, so pads come out clean rather than sanitised — a real difference in a pet or food-spill household. The dock is also one of the larger ones in the category at 17.7 inches tall.

Ignore the MSRP

This is two generations behind Roborock's current flagship line: the Qrevo Master pushes 10,000 Pa and the Saros series goes higher. TechRadar rated the S8 Pro Ultra 4.5/5 when it was current, and the hardware has not got worse — but the list price has stopped meaning anything. It is listed at $1,599 and has not sold there in over a year; most months it lands between $899 and $1,100. At the real price it is a strong hard-floor robot. At MSRP it is not.

Firmware that keeps arriving

On the market since 2023, the S8 Pro Ultra has a track record now: the rubber rollers, the VibraRise mechanism and the dock hardware hold up across multi-year daily use, and the only routine consumables are the mop pad and the dust bag. Roborock has kept shipping firmware to it, with Matter support and improved obstacle recognition arriving without a new purchase, which is unusual in this category and matters if you expect to keep a robot for years.