It works, best one I've used by far. Good pump, not specifically loads of energy but where I'd normally struggle I don't, no massive comedown. I plan on buying more soon but I've got a bag of Bulk Powders Elevate and one and a half bags of GoNutrition Volt which I've got in bulk deals to go at yet. Also, I don't know the guy I was recommended it by my cousin who's been bodybuilding for a few years now so he's tried a lot of different products.