This cage is excellent.  The assembly was not difficult at all.  It is somewhat decorative, extremely spacious for my 5 adult rats and very easy to clean.  The rats love their new home.  There is plenty of room for them to run around and climb.  Make sure you get very deep litter pans so the litter doesn't get all over the cage and the floor.  The only recommendation I have to the manufacturer is that the bottom on both levels should be a bit deeper so litter can't be pushed out of the cage.  But, that's a small issue compared to the high quality of this product.  I recommend it very highly!