We moved into a very small apartment temporally with two cats. My husband brought home the litter robot. In essence it is no easier than a regular litter box. The sensor does not work after a cat has used it so you need to spin it manually. The sides are rubber so the wee sticks to it. There is a lip hanging over which on occasion the one of our cats urinated on. All in all, expensive and does not really do what is expected!