I love the cat tree and one of my cats likes it, the other won't get on it anymore cause when she did it wobbled around -- its kinda top heavy - needs to be wider for its height..or at least the bottom platform needs to be larger.  Cats can get pretty active when playing on these things and the whole thing nearly tipped over when they were at the top playing.  Only option I have now is either build a new platform for the bottom or attach it to the floor,  back wall or ceiling which I really don't want to do.  I wish I had gotten one of the shorter ones.