Xiaomi Robot Vacuum S20chat_bubble_outlineFrom real comments

Vacuuming performance and smart obstacle handling impress many owners. Several users report being happy with the S20/S20+ vacuum performance and object recognition, praising its ability to fit under low furniture like a 10cm bed and its smart obstacle evasion, especially on the S20+. Owners bought it specifically for pet hair and cat litter cleanup, and one long-time user calls it 'amazing' for the price. Removable roller and side brushes make maintenance simpler for those who checked.

Mopping function draws consistent complaints from owners. Multiple commenters say mopping is weak or ineffective, with one stating the mop 'makes the floor wet' but doesn't actually clean, another reporting circular water marks and streaks that persist despite trying different water settings, and others noting cables tangling in the mop mechanism or one mop pad staying completely dry, a problem they say is common on Reddit. The mop attachment also has to be pried open rather than using simple latches, which some call poor design.

Sensor errors and navigation quirks frustrate some users. Several buyers hit a 'cliff sensor error' during initial mapping that persisted even after cleaning the sensors, one unit failed to update firmware and wouldn't generate maps at all, and another owner found the robot only cleaning corners while ignoring an empty center floor. A commenter also asked whether the circular shape struggles with corners, and the app only shows a small battery icon without a percentage readout, unlike a previous model owned.