Product review (5 stars): Works Well
I initially looked to create my own version of this type of device but had trouble finding the tubing to slide up the water line.  Purchased this device and followed the directions to heat up water and flush out the frozen line.  This worked very well.  It took about 10 mins to free up the line with about 5 applications of water progressing deeper up the water line.  I'd recommend this approach versus other techniques such as warming up the water line with a hair dryer as you can keep your freezer door closed the entire time with this solution.  Cool gadget to keep on hand should I need it down the road.