I am on it right now and I F@*%ING LOVE IT!!! I have taken SuperPump250,
NO-XPLODE,
Nitrix, etc...I have tried so many things, but by far this stuff works the best. This is a 10 on a scale, the others maybe around a 7 or so. Yeah it is expensive, but actually you can get GNC Goldcard discount 15-20% off on the stuff, and before anyone goes yelling that GNC is expensive, they are the only ones that carry the 300 count of it and thats all I get from there because I have hookups there and I get most of my stuff online or from a nutrition zone by me where the owner hooks me up. Best pumps I have ever gotten are on NO2 Black. I think its weird how they tell you to take it, so I modified it for me, and it is working wonders. They tell you to take it 30 minutes before breakfast and 30 minutes before lunch. However, I take it 45-60 minutes after my 9:30am protein shake, and then I take it again at 5:00pm (I take a shake at 4:00pm) 45minutes before my workout. I have noticed strength gains and the size of my pump is CRAZY!!!!! I just love the stuff!! Might be expensive, but if you can afford it you won't be disappointed.