We have one LitterRobot in the house which two of our kitties like. BabyKat is terrified of it. She will even run downstairs when she hears it to attack it. Usually all the lights are flashing because she scared Toki and the two of them displaced the unit off its track. Other than that, I love it! Its really great to not have to sift through the litter to clean up after them. All the stuff falls into the bottom compartment into a bag. If only BabyKat would use it! Last time poor Toki didn't get to finish her wee and had wet bloomers. Hopefully one day she can use it without fear of the other cat chasing her out.