I've has this thing a few days and my cats LOVE it. It's their new naptime spot in the afternoons.

I was really concerned about the wobbliness when I first put it together, but if you just tighten the top platform, it does get much steadier. My chunky cat (12 lbs) does make the tree quake quite a bit more than my little 8 lb cat, but it seems like it will hold up well. I imagine the slight movements make the tree all the more attractive to them.  

I think we (the kitties and I) both like that they have somewhere in plainsight to "hide" now. Previously their options were just under furniture, around a corner, or under a blanket. 

My only complaint is that the tree isn't solid and taller. I really thought it would be closer to 6' with the leaves on top, but it's only about 5' with the tallest leaves.