Our two kittens love this condo.  I think the favorite part is the nest on the top left.  They both sleep in it.  I wish it was just a little bigger. The top level is another favorite of theirs and they love the rope.  They haven't discovered the hammock on the bottom yet, but I am sure will soon.
Directions for assembly are very clear, but it isn't that easy to put together.  Took about 2 hours, but worth it.
We are very happy with this purchase and the kitties are too.

Thankfully there is free shipping as the box is very heavy!