I bought this for my sister kitties and they were playing with the parts before I could get it put together!  Was easy to assemble, took approx 1 hour.  They are 8 months old, one is 8 1/2 lbs and the other is 7 1/2 lbs and they both curl up on the two higher perches!  One loves the 'house'
 more that the other and they both love to scratch it!  So, I would highly recommend this to anyone looking for a nice cat tree.