Very easy to put together and totally sturdy. Now here is my problem, we got a tiny little kitten from a shelter and now we find out he is a Maine Coon ( or for the most part)! He weighed 1.2#'s 6 weeks ago and now weighs over 4#. That being said it looks like he will out-grow this quickly :-(. 

Pros: Very sturdy, doesn't look cheap and flimsy. Extremly easy to put together, except I didn't check where the little springy ball went and put the platform on the wrongway! Easy fix duh!