I was a little worried that the cat tree would be cheap and not sturdy when i saw that it came in a pretty small box.  The set-up was quick and easy, and the end product was nicer than I had imagined, and pretty sturdy.  The very top shelf is a little shaky, but it's not "dangerous" by any means (not even for my 12 and 18 lb cats).

Overall, a great value for the price.

Pros: great value, easy set-up