Cats love it! The 3 year old is constantly on it. Sleeps on every level and he's not a small cat. The 6 year old hangs out on it, but prefers his old perches. The only complaint, is that the cats bat the balls out of the "cat IQ" very quickly and then the dogs grab them and are gone! Being able to bat the balls out might be the purpose, but doesn't really work in our home.