Some of you are assuming all teams have experienced well coached 14u players, lol. Or have been able to coach the same kids from birth. I have 2 kids on my team that didnt even make their high school team this year, one of them hasnt played since 10u. Its alot of info at once. If wrist bands help you COACH your team the way you want it coached, and it is useful in helping kids LEARN, then more power to ya.
I have thought about using them, but we just dont have that many signs.