From the ingredients, it looks like a real energy booster, and so i bought one to try out, since i was really sleepy throughout Friday morning.
Though it doesn't have any sugar in it, it tasted really sweet. Almost like a cup full of honey and some lime and some green tea in it. The kick didn't really happen at all, though i did feel somewhat more awake.
I eventually took a cup of coffee off the coffee dispenser in the building. Added some ice and i had a much higher kick from the coffee than the XGT hehe.