I have two of these trees and will purchase more.  Armarkat is affordable and very easy to put together.  Tools included!  Save the wrench that comes with them because if you have active healthy cats like mine, once a quarter you will want to tighten these trees up.  The carpeting is easy to clean and Armarkat sells replacement parts when your clowder scratches through a post.  I was not compensated in any form for this review.