I've been using the Catgenie 120 got about a month now. I already can't live without it. We replaced one of our 5 boxes with it and cannot wait til I can swap 2 more. We have a senior overweight Siamese, a Maine Coon, and 9 Savannah's. All of them took to the CatGenie within a few hours. A couple of them enjoy playing with the water when it starts to add fresh water got the cleaning cycle. Even though they have other litter box options, I would say that 90% of the time they only use the CatGenie, and only use the others while it is washing. Set on cat activated we have only used 1 cartridge of sanisolution so far. We have not had 1 issue. I'm sure 11 cats is taxing on any box but this workhorse keeps on going. No clogs, no draining issues. We even had no trouble hooking it up to 1970s pex fittings got the water supply. I can't wait to replace all our litter boxes with CatGenies.