I have 2 cats.  The kitten loves to race up and down this tree.  The 10-year-old isn't interested; she has had her favorite places for years and doesn't seem inclined to explore.  The assembly was easy; it took me about 45 minutes.  Everything fit like it should.  Though not explicitly shown in the directions, there are little loops on the bottom of the high platforms to attach the toys.  The hammock attaches with clips to the bottom of the 1st deck.  I couldn't do this by hand but with a needlenose pliers it was a cinch.  Shipping was very fast - 2 days for free!