I have been shopping around for a litter box enclosure for a couple of years now. I finally settled on this unit as the stairs and upper area were a great addition for my senior kitties. The storage space in the stairs is very helpful and all three of my cats have been able to access the interior through the opening in the doors. This took us about 90 minutes to assemble with 2 people and no power tools. I did decide to purchase a plastic tray that nearly fills the interior as I was concerned about having the litterbox directly on the wood in case there are accidents. It was NOT easy to find a tray to fit, but I eventually did and am happy I waited to use the unit until then. All in all, I'm happy with this purchase and am hopeful that it will last for many years.