After reading reviews for several cat trees, I decided to try this one. My 10-lb cat loves to run up and down! It does wobble as he climbs it, but there is a sticker advising buyers to put it against a wall or in the corner, so you can't really complain about that. There is no danger of it knocking over.

I also cut the strings off the dangly toys that come with it, and my cat loves to chase them around the house!

Very easy to assemble, extremely quick delivery (2 days I believe!); my cat and I are very happy with this purchase.