You know, I use Red Bull semi-regularly. It works, and it works well-- but not to the point where I get negative side effects, as I've been known to experience with some other brands. (Of course, it helps that their can is only 8 oz. and not the full pint you seem to be coerced into taking with most of those other brands.)
I suppose I could go on and demand my $15 worth of free Red Bull, but why would I? Besides, I liked their ad campaign and am disappointed that it's not going to continue.