Best pre-workout amplifier I've ever tried. If it's good enough for Vernon Davis it's good enough for me. That's all I got to say! Go 49ers!  
On a serious note though this stuff really does work. Definitely give you huge pumps and a great energy throughout your entire workout. I tried a ton of other formulas and this one seems to work best for my body type. This is my first product from force factor and it's really taken me by surprise. These guys actually make pretty good products.

My girlfriend and I CrossFit, So I bought us force factor pre-. First time using it I set a new PR. My girlfriend loves his stuff too!