We bought one 2 1/2 years ago, and the cats liked it so much and used it so much they tore holes in the condos for more windows.  Finally it gave way. So we bought them a new one. This one has the two tone colors. All FOUR of them love it!!

Pros: Since it was our second one it went together alot easier. Seems sturdier
Cons: Had to cut adjustment top piece to fit.