Tried it several times at the BCA tournament 2 weeks ago. Didn't use on the beginner setting, but did on the intermediate and advanced settings. IT WORKS!! You get a very subtle pulse of vibrations shortly after you complete the shot if you execute a poor stroke. If you execute a good stroke, then you feel nothing. Depending on your level of play, I suspect most will be on the intermediate or advanced setting most of the time, and there is a difference. About the only time I was getting it to vibrate, even on the advanced setting was on power stroke shots. However, I was able to execute a few without the vibration, telling me that I was capable of executing a powerful and firm stroke and still be straight, level, and smooth, just not all of the time. I took advantage of the show special they were running and look forward to getting mine in November. It will be used all of the time.
Lastly, I will say I was shocked at the price. I automatically assumed that it was going to be in the $150-$250 price range and felt it was a steal at the current price. Assuming durability holds up on this device, it will definitely pay it's dividends on the investment.