This is my cat's fourth tree in the house - he needs variety, what can I say?  Usually he takes time deciding if he likes new trees, but I have found him all over this one in the first 24 hours. The side with 3 posts is a bit more sturdy. The side with only 2 posts wiggles some, but it hasn't stopped my boy from bouncing all over it. Oh, and I put this together all by myself in under an hour.  It was super easy. Now I just need another cat to play with him on his jungle gym.  Follow him @SirPurrrzzzAlot