I have one obese cat who is EXTREMELY picky about everything. She will only use one kind of litterbox and is very selective with her toys. I spent a lot of time trying to find a cat tree that has shelves that are large enough and crossed my fingers that she would use this one. After taking a couple of days of her getting used to it and a little bit of catnip, she is totally hooked! She uses this everyday and it is now her new favorite sleeping spot.