I ordered 2 CatGenies because I am on the road a lot and thought that 2 was better than one with 3 cats. I have one set up on cat activated and the other set to clean 4 times a day. So far I am loving them, other than the tracking of the Washable Granules. I just ordered a mat for both of them to help solve this problem. My cat sitter and I both love these! I have only had them about a month now. My cats took to them right away. One of my cats sits and watches it go through the cleaning cycle. He is loving having a cleaner little box. I tell everyone I know that has indoor cats about the CatGenie and tell them how much I love them.