Ok, have used this robot for a month. This is my first robot vacuum or mop.1. Most importantly, it REALLY CLEANS, especially the mopping function. It notes a soiled area, increases the cleaning strength and does additional cleaning runs in that area until it is clean.2. The app works FINE. Like any app, you need to use it awhile to get to know all its features. Those who write that it can’t do multiple floors— yes, you can, up to 4 maps. You can move the entire ensemble “upstairs” — or guest house, etc. OR you can carry only the robot itself—but then it can’t go “home” to wash the mop. Or, make 1 map without the base and use it for vacuuming, and another map for moving the whole kit for full service capability.3. Easy to do a quick “ spot” cleaning in a small area that can be sized to the area for a spill etc.