My cats love to play  on the tree, particularly my young year-old who does gymnastics and has a great time.  I'm glad I only got the 57" because it is a bit wobbly but he doesn't seem to mind at all. That's why I only gave it 4 stars--he would give it 5.  It was easy to put together but you do have to remember to tighten it often as suggested.  Especially if the cats are as wild on it as mine. They all love the fluffy balls--more than all the toys I have bought them.  I just keep putting them in the cubby and they toss them all over.  A great buy!