I'm going to try a new one called Adrenaline. Can't remember who makes it though. Contains real caffeine, real ephedrine, synephrine, yohimbine. None of this herbal bullshit. I'm sure that stuff will really kick your ass.
I have been using Lipokinetix for about 12 days now and I must say, minus the fatigue later in the early evening, this stuff rocks! But I can agree with others that have used it saying that you feel like shit after a few days. I work our early in the day when energy levels are higher. Come late afternoon, I just want crash.