So a few weeks ago I bought these sensors you put on the end of your clubs that help you track how far and how well you hit your clubs. Via bluetooth and with the app, they sense where you are hitting your shots from and which clubs you have in your hands and over time would give you insights into your game. Well, after 2 rounds I returned them to Amazon for a refund. My big complaint was 3 fold...1) I didn't realize the NEW version of the devices come with a 1yr free subscription but after a year you have to pay $100 for the ability to continue using them....2) the "system" missed a lot of shots...case in point, on the first hole of my course, I hit my tee shot about 100 yards short of the green, then bladed my wedge over the green. Then chunked my 58 dgree wedge...chipped up and 2 putted for a 6. The app..said I had a "1" on the hole because it failed to read any of the other shots other than the driver. .. 3) I found myself so focused on whether the app was recording the shots - and if not me adding them- that I wasn't focused on my game. I am not sure what I hoped I'd get out of these, I think it was understanding where my misses where to see if there were consistent trends...but the fact the sensors missed so many of my shots, just really turned me off.