I love this thing.  So does my cat.  It has plenty of room for a large littler box and space for my scooper, bags and extra litter.  It is strong enough to sit on (and I am not a small person).  The best part is that it looks like a nice piece of furniture with clean lines and if it is set up so you can't see the kitty entrance, no one knows there is a litter box in the living room.  Well done on this item.
I do suggest the following.  Get someone to help you put it together.  It is doable with one person, but not easy to fit the top down on the base without extra hands.  I also suggest you calk the cracks between the base and the walls of the box.  It will keep the litter out of the cracks.
Thank you!