While I love the finished product, the assembly was the reason I gave 4 stars.  The directions stated to attach the "lettered" pieces (sides) and of course none of the pieces were labeled!!!  So I had to do the assembly by trial and error and looking at the finished picture on the box.  I assembled by myself and it took me about 3 hours.  My Chinchilla is very happy with the end result.  I did use some assorted stone tiles to cover the floors as I didn't want his feet to get stuck in the wires.  He uses all three tiers and the cage is very easy to clean.