I like that ingredient list for sure. It does have caffeine, so not totally stim free... I like a lot of that list for sure... Why did they drop the AAKG though. I've found the AAKG to be really beneficial to pumps for me.
Arginine supplementation = Fail
Every arginine based pre workout I have used has eventually led to diminishing gains. They work for a few doses than nothing and I have to cycle off. Even the world famous Amp02 lol. XF purposly left the Arginine out of this product. The ARAsyn (Arachiodonic Acid) and the citruline malate are the main pump factors here and the pumps will only get better with repeated use unlike other NO2 products.
The caffeine is minimal. I beleive it is listed because it's in the green coffee extract.