My two adult cats love it, they both have claimed their respective spaces and if they feel like it play king of the mountain. The cubicle is a bit small for the larger Oscar however, she can cuddle up with only her butt or her head sticking out, she does not seem to mind. The little girl loves the top shelf.  
Assembly was quite easy and quick, only one hole did not line up exactly but I was able to work around that.
I love the way it looks, especially when both cats are sleeping in their places.