My cats are old and are mostly 12-16 lbs monsters. The tree goes together well but the instructions are confusing with regard to which length tubes go where. It is essentially cardboard tubes with glued on carpet so I don't think it's longevity will be fantastic (part of the 3 star rating) but my cats won't go near it. It doesn't feel solid underneath them, especially the hammock, the arch, and the top tunnel (the other reason for the 3 star rating) so they did an initial once-over and haven't touched it since. I even moved it to the place where the morning sun would warm it and they'd rather sleep on the floor nearby.