Was wondering if anyone has tried those expensive little 5-hour energy "drink" containers? Do they really give you a boost for an extended period of time? I am pretty impervious to caffeine for the most part these days - drink plenty of coffee and pepsi, so I could see something like this that supposedly doesn't make you crash after being a nice option at times. Of course I'm skeptical, but seems to be a pretty prevalent product these days. Any first hand reports?