More than 7 years ago I bought the cat Genie 60. I have 4 cats and when I heard about the Cat Genie 120 with cat activation I opted to get the Tuxedo version. I had that unit for 6 years with 4 cats. A couple of times I called customer service for help with troubleshooting and I have to say that this company has top notch customer service. Was able to fix the issues with assistance over the phone until finally after 6 years of faithful service the power unit needed a rework. I decided to get a new unit; my kitties have become very used to it. They are indoor cats and acclimated to the unit very quickly. The few granules that get tracked out are SO much easier to clean up than the dusty gritty traditional litter. Until I have cats that use the human toilet, this is the next best thing. To anyone who says that this is expensive, I say look at the yearly costs of purchasing litter, and then paying to dispose of it. And the dust of traditional litter is not healthy for human or feline. I just love this product.