It smells quite refreshing, actually. There's a vague aroma I can only describe as "dairy", and a hint of vitamin B.
It's not unpleasant. If it were possible to have managed to get energy drinks right, I'd have to say Red Eye are the ones who've succeeded at it. You can taste the unmaskable vitamin B, which shares a flavour with rotten celery, and the dairy smell somehow manifests itself in a taste which is actually kind of chocolate-like.
There's a noticable aftertaste of vitamin B, although it's more of a chemical flavour than the aforementioned tang of rotten celery.
Again, it's not unpleasant. It's not great, all energy drinks that make a big deal out of including vitamin B either suffer from a deplorable taste of rotten celery or from being overly fruity to try to mask the horrid vitamin. This one's kind of a half-way house between the two flavours.