I got this for a fearful and aggressive rescue cat; my vet suggested that I get her more vertical space.  She started using it right away, which is a definite plus.  The upper enclosure is small (she's an 11-pound cat so not huge) and her paws and tail can't fit inside, so she tends to prefer the lower one.  The pedestals with the platforms are wobbly and I've had to lash them together so that the cat won't fall off them and get even more traumatized; so far she's avoided them.  The assembly illustrations aren't great since so many of the posts look alike.  Wish they were labelled like the screws were.  I'm on the fence about whether or not to keep this, since it isn't as sturdy as I'd like.  I'm going to let the cat decide if it stays or goes.