GFuel is fun and tastes great, but you're be better off buying powdered Kool aid and adding powdered caffeine to it. You would save a ton of money and achieve the same results
The main issue with GFuel is the ingredients not being included in enough of a quantity to achieve a therapeutic effect. As an example, "26 mg Antioxidant Blend" sure looks impressive, but in reality that's like taking a spec of dust and mixing it into your 16 Oz cup of water.
If you truly want a gaming supplement, Gorilla Mind Respawn is what I would recommend. I give GFuel three stars because it does have enough caffeine to give you energy, and tastes great, but costs way too much for what it is.