Our 2 new kitties love this tree!  The tubes are a great place for them to sleep as well as playing in and around.  This also serves as a great lookout for them and a way for them to get away from the dog.    Not too big and it allows for a change in structure...take it apart and put it together in a different layout.  It's great.  A little wiggly, but it has as much to do with the cats running like banshee's up the ropes.  Would highly recommend and for the price, can't beat it!