If you don't wedge it into a corner it's a little unsteady and for any cat over 5 lbs it's probably not for you. I got it for the enclosed level (which he doesn't even use) but I love it because he scratches it instead of my couch. A great deal! Oh, and waaaaaay easy to assemble! 

Pros: easy to assemble, keeps them occupied
Cons: not for adult cats