I dreaded opening the box to assemble it.  However, it was easy as pie.  Great quality  and my cats love it.

Edited 3 months later:  Well, I took this down from 5 stars to 2.  Did I say great quality?  Well, I was wrong.  In the first month, my 6 month old kitten had actually broken the arms off.  When they broke, I found they were put on the base with very small nails.  I had to be sure to remove them all and completely remove the arms so my kitten wouldn't get hurt.  I have older cats too.  They had no interest in playing on it but do like to sleep in the little area in the middle.  Clearly this was not made for kittens.  Good luck!