Well I felt the need to take one of these shots before I gave it over to my fellow employees. Sure enough as the person above had mentioned it is fairly "pure" energy. No jitters, shakes, or crash. I took it around 11am and started to feel a little let up around 6:30pm. My mind was clear and focused and I was not scattered or wired. I lasted feeling pretty solid until about 8:30ish. That's a good run for an energy shot.
Coming from a vitalist perspective I would not personally take these on a regular occasion nor recommend them to others for regular use, however I do know that if I was going to need a little herbal assistance to maintain some energy and focus this would be what I would used.
Flavor was bad but no worse than I would have expected. Within seconds I experienced the effects of the habanero, gingko and ginger warming my body and making my face/head read. The shot did its job however as Uny points out above lack of energy is a symptom and should not be treated in itself without addressing the cause.