I Have been playing since I was 12 and had my first HIO at 13 and couldn't see the green when I did it. 5/27/2017 I watched from start to finish on the 211yd down hill par 3, #3 at Red Hawk in East Tawas MI golfing with my Fiancée. Had to call the foursome in front of us to come back and witness before we got down to the green. We were on the start of a four day golf weekend and after that nothing else mattered.