We have 2 kittens that are 3 months old and they absolutely love this to play on and sleep on. Also have one older cat who although isn't near as active as the younger ones he does sleep on one of the perches. 

It is fairly large but extremely sturdy and I like the fact that it is finished on the underside. Got this in November and it still looks new. Only thing that has happened is the hanging balls that come with it were chewed off in like 10 minutes.