Despite what people may think, 17 Hd is a product that actually gives you a boost. I got some free samples from Vyotech and using it 30 minutes before a workout feels like having about 5 energy drinks! No caffeine in product, but feels like there is. Most people I know that have tried this product really liked the effect.
I'm sure there are others out there who would call it a waste of money, however. Worth a try if you can get it at a decent price.