Well this is the semi verdict. All 3 cats are using it. I just today removed the old stinky filthy one that they had stopped using. Fingers crossed they get it! I love the thing. I haven't had any problems with it again. If they do ok with the old one completely removed in September I will get a 2nd litter robot! With 3 cats (soon to be 4) I think 2 would be best. Now if I could get them to stop ripping up my furniture and blinds life would be swell.