My thoughts
It does not focuse on hand speed and rotation but focuses on hip rotation, it covered the simple stuff but does fully focuse on getting extended or staying tight to the baseball but more on how fast your hip rotation is. And it shows that your hands and hips need to fire at the same time. The down side to this is that you have to pay for 25+ swings. I could see this just helping you with getting more power from your rotation. My best was 95 out of 100 and I got I lot of hip rotation. I think it is pretty accurate for a an app.It does not work on your bat path. Those where just my thoughts. Hoped you liked my review. I just would not use a app but this one was pretty accurate for mechanical adjustments.