Ok, a sample is not exactly a ton to do a serious review, but I got one ofin my last NP order and tried it today. I didn't take any pre-workout (although I did still have leviathan, but I usually take both, and sometimes a pre-workout stim drink too). Blast seemed to work out really well as a pre/peri workout drink. I'm currently doing GBC, which is arguably one of the most straining workout schemes on your CNS. I felt nice energy throughout the workout, plus recovery was fast between sets + supersets. I had enough whoomph left in me at the end to do an extra 20 min of cardio, which is rare. Never really felt speedy, I just felt good.
BTW, I mixed it with hawaiian punch wild purple just for prld2gr8ns. It did taste a little odd, but was ok.