This stuff is incredible....I had insane energy and power after todays workout...felt like a totally different person. It gives you the power to pump out that last rep when your muscles would normally fail you. I was debating between buying this and Jack3d but I'm glad I went with the NO.
I guess the only con is it makes you heart race in the beginning, until the effect gradually wears off an hour later. For those who take it: do you experience the racing heart as well or is that a bad sign that I shouldn't take it?
FWIW I used two scoops with 10oz of water.