Not stupid, what he removed is evident, especially after walking the dog in the rain, when he collects both wool and dirt from his paws. Has pros: It builds a route not bad - before that there was a cheap model of another brand, from aliexpress, it just rode chaotically with varying success, but this one only foolishly rode around the rooms for the first two cleanings, then a detailed map of the apartment appeared in the application and now he or he builds a logical route in auto mode, or I or my wife set up a cleaning area for him. Yes, this is actually a "smart" vacuum cleaner. Cons: Washing the floor is far from a mop, purely "freshening the atmosphere. "