Like many cat owners, I was worried he wouldn't use it, but our cat loves it. He couldn't wait to try it out and was so excited and being a showoff running up and down it. Cookie loves the hanging ball and string, but he's been playing rough and already tore one side of the ball.  He is a large cat and I was worried he wouldn't fit comfortably into the condo, but he fits fine and he really likes his new hangout. 
It was pretty quick and easy to assemble and is of good quality.  It also sells for a very good price and free shipping makes it even better.. Although it is very sturdy, I might suggest to anchor it if you have a large cat that likes hanging out on top like mine does.