Product review (5 stars): Best of the three I've tried.
This appears to be the best designed connector of the three that I tried.  I used it to repair a broken water tube on the back of my Kenmore Elite refrigerator, this one has a nice design that prevents the tube from going in to far.  Locks in nicely and creates a good seal.  One of the other two allowed the tube to go to far in, then the tube wouldn't go in far enough on the other side and it leaked.  The second one was better but not as good as this GE connector.  I recommend starting with this one and skip the other brands!  I like it so much I'm ordering an extra because that water line continues to be problematic.