My boyfriend & I just received this tower for our cat yesterday & I think we love it just as much as he does! My boyfriend was able to put it together within 25 minutes, and even though he is a handy-man, someone who isn't could easily put it together quickly too! Oliver is 9 lbs. and it fits him perfectly. It is steady and doesn't wobble or shake when he jumps around on it, and he can lay comfortably on the ledges. He loves laying in the box, however, if he were a little bigger I would be worried that he wouldn't be able to make himself comfortable in it, as he fits pretty snug in there at his weight now. Prior to this tower, we struggled to find a scratching post that Oliver deemed "good enough" but as soon as this was up he was scratching immediately. Hooray! My leather couch & I are very happy about this! We are definitely happy with our purchase & I know our Olly is super thankful, too. Highly suggested!