Good product.  I got this one with the wider door because my cat is obese, large, and old.  I am not convinced that jumping out of the top is really a way he could exit this box.  I am considering trying to file off the little tab on the back of the door that prevents the door from being used for both entry and exit.  I would think the manufacturer would have made this tab more easily removable for cats that were not willing or able to jump out of the top.  I'm just hoping that my attempts to remove the tab won't cause the rest of the door to break or crack.  Other than that design limitation, I am happy with the product.