For the price it's a great buy. I start it in the morning, while I drink coffee, it travels around the whole house in 40 minutes (I transfer it separately from room to room, since it does not build a map, and may simply not leave the room). It gets to the base itself if it is within the room, if it is in another room - it can search for 10 minutes, but usually it finds it. If it gets stuck, it beeps. The wires do not tighten, it collects small debris perfectly, it also cleans carpets well, with daily use you can forget about the usual large vacuum cleaner.