Let me start off by saying that I bought this for four very crazy kittens.  To say that they gave this tower a workout would be an understatement! This is sturdy and actually attractive.  Nothing like the cheap pressboard that they sell for double the price at Petsmart.  (Yuck!).  The kittens are all adopted and now my adult cats are enjoying the tower!  The ONLY downside is that the "dangle ball toys" (there were two) were torn down within a few days.  They are only attached with a staple and string so any extreme pulling will bring them right down. Other than that, you just can't go wrong with this one!