They're ok, but not really superior to red bull or anything of the ilk.
What i have found, however, is that the SoBe Adrenaline Rush, Sugar Free Energy Drinks are quite a nice Pre-Workout boost, loaded with B-vitamins and Creatine, Taurine, Arginine, and Glutamine. Delicious tase, to boot.
Still superior to this product is something that I have encountered several times but can no longer find; a product called "YET: Your Energy Tonic". In terms of Amino Acids and B-Vitamins, this product is unbeatable. The one caveat is that it tastes pretty disgusting.
I personally would take the SoBe drink, you can sip it like a beverage too.