I have a lot of hanging hummingbird feeders around my yard, but this one intrigued me since it is mounted on a window. It was easy to assemble and after cleaning the outside of my window, the suction cups adhered well to the glass. A pointer: Mount it before pouring the solution in the two compartments, or you'll likely end up spilling some of it in the process. Mine does end up tilting slightly forward while hung, but I don't see any way to correct that. Since the reservoirs aren't very large, you'll end up having to refill it frequently if you get a lot of action from the hummingbirds. I don't get a lot of them feeding from this one, probably because it's outside my office window, and even though my desk isn't right next to where it's mounted, my presence is probably a distraction to them. At $12, I feel that it is a good price for the quality and unique functionality of this product.