Personally I think it is a waste of money. If you are looking into supplementing I would first make sure that you are.
1. Getting at least 0.8grams of protein per lb of bodyweight
2. Getting sufficient EFA's in your diet, ~3 grams per day
3. Eating sufficient calories in relation to your goals
After that is in order, I would have to say that the only two supplements I have found that are worth the money are Creatine, and ECA's.