It's hard to rate something for a cat! She is frequently sitting on it...but only the hammock part of the tree. 
Cons: The base is not too stable and therefore, prone to tipping. But you could probably move the platforms to stabilize it better. 
And the screw holding the circular part was not long enough so I had to go buy the most similar screw I could find which is slightly too long, so the circular section is not securely fastened to the top platform and wiggles around.