While the can looks impressive, the product inside is, well, "ho hum".
Looking at the ingredients, Sun Tzu's energy comes from a very basic blend of sugar, caffeine, and taurine. The rest is all show.
In fact, the product's website says describes it as a "novel energy drink", and seems to focus more about Sun Tzu, the ancient Chinese military strategist, than it does on the drink itself.
Sun Tzu is distributed by the same company that distributes "Krank2O", caffeinated water.