1) you will almost definitely need a training partner for motivation. The vast majority of people can't stick to a program like TuffCuff, nothing against you in particular.
2) if you stick to it, it's a very good workout to get you in shape for pitching. I would highly recommend it.
3) It's more than just workouts, it's about diet too. Few are committed to making the necessary dietary changes to maximize their performance. If you are committed, there is some great info in TuffCuff about the right kinds of food to eat.
If you follow the program through to the end, it will be worth far more than then 65$ you paid for it. IMO, it's a vital tool for any young dedicated pitcher to have.