Our 6 mo. old cat loves his tree.  It took him about 2 weeks to try everything-- except the hammock. He still hasn't tried that. This tree is better for small cats.  I don't think he'll fit in the tube or the house as he gets bigger, but we'll see.  It took us about 15 minutes to put it together and it's very sturdy.  Sitting on a carpet, it wobbles a bit, but he doesn't seem to mind.