Stuff is nasty, nasty nasty. Tastes like bubblegum soda that someone put a cigarette out in (yes, I realize how much of a flavor stretch that is...Red Bull does it).
It's not just caffine....Jolt had a ton, and didn't taste like shit. No, it's the Ma Juang (sp), which contains ephedra, which runs you like a top...
The easier way to do it is just take some Stackers, or some Ripped Fuel, or something similar. It dehydrates the crap out of you, and if you're a beer drinker, I have to tell you that means you're going to be pissing more than normal since it acts as a diuretic.
Plus side? Absolutely wakes your sorry, drunken ass up. You get a nice boost of energy that lasts for a few hours, and for some reason (for me at least when I've given it a shot) it keeps me from getting a hangover. Also, and this is strictly my experience, it turns you into Conan the Thrusting...Mostly because you're drunk as a skunk and should be unconscious and therefore unable to ummm..."Perform", but instead you're awake and doing the best you can.
Negatives? Well, it didn't kill me, but I can imagine it is far from a healthy thing to do to yourself. Over an extended period of time drinking with it, you're probably screwed anyway, because if you're drinking that much you've already got enough to worry about. But I really wouldn't make a big habit of it. I don't mean to compare it to pounding bottles of Jack nightly and doing blow off some hooker's thigh, but if you're taking uppers to improve your ability to continue drinking on a regular basis, you very well may have a problem.
Your milage may vary.
Live Free or Die.
Vass