I have a bunch of different PWO drinks-- C4, white flood, condense, noxipro, 1MR, d-stunner, vasocor, and whatever else I can't remember right now. I've tried a bunch more but these are my favorites I keep on hand.
I have tried both old and new C4 and while I prefer the old version, the new one is still a quality PWO. I get a good stim effect, decent focus and great pump.
To say I'm addicted to PwO is well...whatever. Many people drink a ton of coffee and I don't. But my training sux without a pwo