I have used when driving through the night. I drank it when i started getting that zoned feeling (2 a.m.), if you know what i’m talking about. While I can’t say it got me wide awake and perky, I can say that I wasn’t drowsy and I was able to drive for a few more hours. Lasted me till sunrise which always wakes me up.
While I am sure the main ingredient is caffeine, there is plenty of other stuff in there. While I can’t prove there was no placebo effect, it did work better than coffee works for me.