I love this cat tree.  It's very heavy - came in two boxes - and feels very sturdy.  My two 9 month olds are all over it, and they also love playing in the giant box it came in!  I've left it in the middle of the floor for a few days for them.  I cut a few pieces of flannel to put in the cat house boxes and they took to sleeping in them immediately. There is always at least one cat in the tree all the time.  This cat tree well worth the money.  Easy to put together.  An allen wrench and paying attention to the instructions.  Everything was labeled so it didn't take any guess work.