I thought that Birds Choice - The Great Hangup Super Strong Window Hook for Bird Feeders would be perfect to use for my bird feeder. I thought that the clear plastic hanger would give me non-obstructive view of the birds as they feed. The hook it self is well made, however, the suction cups do not hold up. I tried different windows, with different sun intensities, clean glass with wet and dry application, but still the suction cups came loose.