As far as potency and effectiveness go, Gameday kills it; without question one of the best pre-workouts I've ever tried from that standpoint. And, at the end of the day, that's what it's about, so this gets 4 stars.
It doesn't get 5 though, because the taste is brutal. Like, it's night and day different from the stuff that BuckedUp or Mtn Ops are putting out. This is super chalky, doesn't mix well, and the flavor is just.... off. Maybe I got a bad batch, I don't know. But this tastes like what pre-workouts used to taste like before companies figured out how to make them taste good.
Don't get it twisted, it's effective enough that it's 100% worth choking down before a workout, but if they could get the flavor/consistency right on this, it'd be the only pre-workout I'd ever use.