My two cats absolutely love their first tree house Samson(Mainecoon) literally lives on itin it. He especially likes the higher of the two hideaway boxes and uses the scratching post at he bottom. I bought this in the dark gray version. We are in the process of moving house, so at the minute its upstairs but we intend on take it down stair and put it in he lounge, pride of place. At the minute its not fastened to the wall and seem solid enough. Another 5* purchase from Wayfair. And super quick delivery!