This product is great. When I was building it my cats kept getting on all the parts before it was even put together! Building it was really easy. I am 13 years old and I did it with no help whatsoever. My medium size cat just adores it. My bigger cat, Snowball, hasn't got used to it yet because Cloe is always on it! I would say though the top platform is a little unstable at first. You just have to tweek it until it doesn't wobble that much.