I don't have anything bad to say about this tree house except maybe the top perches could be made bigger for larger cats. Instructions are a tad vague going by the picture/instructions.  This is my second Go Pet product.  My first tree house by them held up totally for 3 years now.  The carpeting does not tear, but the sisal unwinds on it.  Just cut and retie. 

Pros: Great value and much cheaper then pet stores and retail stores.
Cons: Just needs larger perches