This cat tree is huge!  Floor to ceiling.  It has an adjustable post at the top which tightens to the ceiling to stabalize the structure.  If you don't do that right it will seem unstable.  Material is sturdy and the sisal rope posts are great for scratching.  The mechanics of this tree is great.  the enclosed covered rooms can be opened up if you just want a platform rather than an enclosure.  They velcro closed around the bottom edges.  Fairly easy to put together altho I had to start over twice before I got it right.  Love this! and the  Great price!  Five star*