iRobot i7+ bought 1.5 years ago. My wife was very skeptical about the purchase, but after 6 months we decided to clean a large garbage bin, she said I take my words back. It works mainly in the evenings after dinner, I run it in the kitchen once a week throughout the apartment. By and large, the only negative in cleaning is to raise everything from the floor, if possible, raise chairs, and so on, small things. For the rest, I'm happy with everything. For 1.5 years, I have not changed a single consumable yet, the bag was thrown out and reused. In stores, it costs 700.