This is a tough review. since cats do what cats WANT to do, and humans just go along for the ride. So I will say that the product worked very well.  Held up as promised, with no slippage of suction cups if cleaned right.   My 10 pound cat was very comfortable...for about 10 minutes until he lost interest...and the suction never failed.  If you have cats that like a "view," this may be the item for you.  Easy to install; easy to uninstall without damage; not threatening to the cat's already established space.  As cats do:  the either take to it or they don't.