I'm very pleased with this purchase.  My cat loves it!  It's easy to put together, well designed, and pretty sturdy.  I loved the rounded corners and the plastic platforms are very large and stable.  The hammocks are not as good for my cat, she's a little afraid of them and doesn't trust them so I'll probably be replacing them with more platforms when they become available to purchase separately through this manufacturer (Feb 2016).  The three large access doors are very nice to have as well!Pros: sturdy, large, well designedCons: hammocks are a little unstable