I have had my CatGenie for almost 3 years. I bought it for a 19 year old Burmese initially. When you died at 20, I adopted two 1 year old Burmese cats and wondered how it would work for the pair. These two 'pound kitties' have had some digestive problems, so occasionally I have had to skim small pieces out after the granules have gone through the cycle, but in general if functions just as well as it did for one. I really love the convenience of the device. The hoses run through a closet wall and under a whirlpool bathtub coming out small halls in the side of the tub near the toilet. There has never been an issue. When this one goes, I will definitely buy another. Love not having to deal with a litter box constantly, and the cats love having a clean box all the time.