Got the EXTRA Large size of this box - and I Love It! Love how solid the materials are - and it is easy on the eyes.  It was easy to assemble - the directions were a breeze to follow.  My senior cats took right to the enclosure - in and out without issue.  I put an extra large litter box inside of it - the enclosure helps to contain the mess of the litter and litter box smells.  Am Very Happy with this purchase!