My cat doesn't care much about catnip and is very picky about her toys, but she loves to climb, jump, and scratch.  I hadn't finished assembling this (which, by the way, was very quick and easy) before she was climbing into and over it and trying out the sisal scratching post.

She loves all four levels of this condo, which is very sturdy and doesn't shift or shake when she moves and jumps.  The carpet is soft.  I'm very glad I bought this.