We have had one of these for a year now and the birds love it. It works perfectly and is just the right size to encourage finches, nuthatches, chicadees, sparrows all while keeping the Jays and Mourning Doves off (they get the tray feeders). This feeder the first to empty, and you can't beat the price. We drilled a hole in the bottom of the bottle and hung it up with baler twine. I am ordering more and cannot wait to try the one that suction cups to the window.