I have 4 cats and they love this. They take turn in the bed but also enjoy the other steps and toys.
I would have appreciated knowing where the pieces went on the base. Bottom could have been marked with piece number.

Pros: I like the height, the scratching posts and toy with spring.  
Cons: Would have liked size of bed, my cats just fit. I had some confusion in which piece was 6 and which was 9.