I bought this for our 4 month old kittens for nighttime and when we are out. Within 3 days, 2 of the support pieces of the frame were broken so now the 1st shelf is just hanging. It is also nearly impossible to clean. I have to crawl into it with a hand broom to sweep it out. Its a good idea and I have built similar structures out of the metal cube sets for my ferrets. But this is just not sturdy enough for kittens, much less full grown cats.