I have never considered a window hanging feeder as I just didn’t feel that it was a long term solution.  I was worried that when the suction cups started to dry that the hook would fall off the window.

I put this hook on my kitchen window over a month ago.  I cleaned the window, licked the suction cups and pressed them down on the window then I hooked the feeder onto the hook.  It has been on my window and hasn’t moved in all that time and we have had winds hard enough that it has sent my patio umbrellas flying into he neighbors yard.  My bird feeder is still hanging.  

I wish I had found one of these earlier before I had to get up on a ladder and screw hooks onto the eves with long chains to hold my feeders.

Since the suction cups and hook are transparent it does not take way from the view looking out the window.