This is one awesome cat castle.  I chose this one because the base looked more solid for the height of the tree.  My cats love to get a running start at the tree.  The top beds still wobble a little if they hit it at a full run but otherwise they love to lounge on it.  Was easy to put together.  The instructions were pretty vague when it came to the top layer but I got it figured out and it looks so nice.  The price was ok for the quality.  However, if it wasn't on sale I wouldn't have purchased this one.