We purchased this when we found out that our new kitten was a good climber.  She was all over this thing the minute it came out of the box.  She loves sleeping on the very top level.  The only thing that I noticed that both our cats don't like is the hammock on the bottom, it swings around so much that they don't trust it and completely avoided it.  
    Other than that it's a great design and well worth the money, don't regret anything about it.