This is a practical design in a nice neutral beige color, and made of wood instead of cardboard (at least the posts are made of wood, which I could see when I assembled it....can't speak for the carpet-covered kitty shelves).  The assembly was VERY quick and easy.  
The only reason I didn't rate this cat tower as 5/5 is because the longest post on the tower (the one that leads up to the highest "kitty cup" at the top, and which is actually made up of 2 posts screwed together) leans at a 5-10 degree angle.  That's not a big lean, but it's enough so that it annoys me every time I look at it.  It should be straight up and down.  I think this problem would possibly not exist if the posts had a larger diameter.