I put this together within 40 minutes and it took that long because I started at the top and worked down instead of bottom up.  It is sturdy if only 1 cat bounces around but get all 3 of my cats and it will tip.  I can't give this anymore than 3 stars because it is WAY too small for adult cats. The top perch, the "condo" and the short board opposite the condo are for kittens only.  However, they do like the high board where the cat is lounging in the picture. For the price I paid on sale I gave it 3 stars.  If I had paid more, I would have given it only 2 and possible returned it.