I was talking with some other coaches the other day about pitching and mentioned that my daughter was struggling to really engage her lower half when pitching. One of the guys mentioned that a player on his team who was having a similar problem had started using the Power Drive and was improving a ton. I don't have a problem buying things, but I am always leery of things that could be gimmicks. Watching some videos it seems decent, but I tend to trust opinions around here. So has anyone used it? Know someone who has? Opinions on it?