I too have used N02 and had quite a descent pump and leaned out a bit ( maybe because of my diet

) but in my 4 weeks of using this product I was totally dissappointed.

I didn't gain a pound of muscle only an empty feeling in my wallet.
I took it back to the GNC store since it's guaranteed and exchanged it for N0xplode...and they did honor it but the manager told me that I couldn't exchange any more products because their products didn't work for me.
I really did get swept by the commotion of N02 and it's perpetual pump but it's just a waste of money IMO.
