I love love love love this cage. It was easy enough to put together that I did it completely by myself. The tray is much deeper than I thought BUT!!! The one thing I don't see anyone mentioning is how slippery the ramps are. My Guinea pig can't go up them and can only slide down them so until I figure out how to make them usable she's stuck in the bottom which defeats the purpose of the additional layers of the cage. I also watched a video of a ferret unable to get up them. So it's quite the problem.