This is the only cat tree I've ever purchased.  I'm not sure whether it's just this tree or my cats, but they're really not too into it. My older cat is 3 years old and about 17 lbs. He's too big and/or chunky to use the tree.  My kitten however does use the top tier when she's wanting to get away from my bigger cat :) Like I said it's the only cat tree my cats have ever seen so maybe they're just not into them.

Pros: Easy to put together, seems like cats would enjoy it
Cons: My cats don't really care for it