This was a huge hit with our three cats! The only downsides have been putting the darn thing together as the directions are terrible.  Also, we have a slanted cathedral ceiling so had to hook it to a wall because it wasn't able to stay in place.  Totally worth the money though as the cats have been in it constantly since we set it up, even our little PomChi likes the lowest level (he doesn't seem to realize he's a dog).