I have two large male cats and wanted something like this to place outside on my covered patio so I could conceal (somewhat) their bathroom, keep the litter from spreading, and use the surface for plants, set down a drink, etc.  This works well for that.  It was easy to put together and appears sturdy enough, even for the heavy cats.  I did not put on the door; I was concerned my big cats would not use that small opening.  The structure does not seem to be compromised by not having the door.  The material is easy cleanup, and assembly required no tools and was fairly easy.  This fits one of the jumbo disposable litter boxes, but just barely.  I have to tilt it slightly.  While it seems sturdy, I do hear creaking noises when the cats are covering their waste. 
I would have given it 5 stars if it was another two inches wider to better fit the disposable litter box and if it had another support on the bottom for more structural integrity.