Have had my Blackstones for 2+ years. Took a while to figure out how to use them. I read the instructions but didn't fully incorporate them into my routine. Once I did, my game started moving forward as hoped. I made a little cheat sheet from the driving range and had that with me on the course. It was amazing how accurate that became when followed the instructions. The biggest thing that happened was centering the ball between my feet and consistently using the same swing length for each shot. I'm a lot older than most players (77) so swinging the same each shot was the answer to my game. I'm not quite scoring my age yet, but I'm getting there. Love the Blackstones!