NO2 is bunk, there is no sound scientific proof to prove the claims that this product makes. You can get good pumps just by ensuring you have enough carbs in your muscle stores, enough water consumed throughout the day and making sure to use
high intensity in the gym.
As said before, you cant compare NO2 to creatine...because yep, they are two different things...and besides creatine is PROVEN to work amazingly on just about everyone...NO2 is pure hype, and like said before, I wouldn't waste your cash on it.
To date, there is no better supplement than these two:
whey protein and creatine. Period!