It's all Red Bull's fault. "Red" has apparently become a convenient catch-all buzzword for energy drinks. Between Red Eye, which is pleasant, and Red Bull, which is bile in a can, it's a shame the term cannot be safely used to distinguish the palatable from the impalatable.
Red Devil is alarmingly tomato coloured. It kinda looks like someone has bled into it. It's not a comforting colour. I had anticipated it'd look somewhat like Red Bull, based entirely on the contents being similar. I'm almost disappointed.
It smells exactly the same as every other energy drink that tries to disguise the patently disgusting flavour of b-group vitamins with some kind of uberberry fruit deluxe syrupy flavour. It smells very much like someone's vomited some berries and added Berocca.
At the risk of offering a cheap-arse description of the flavour that'll be of no help to anyone, it tastes virtually identical to Red Eye Gold. It's got a strong medicinal flavour, buried beneath an unpleasant taste of partially digested berries, all of which are swimming on top of the unpleasant vegetable flavour of b-group vitamins, which still manage to poke their hideous heads through the masking agents to make this a vaguely unpleasant beverage. As flavours go, this one isn't too bad. I was afraid it'd taste like Red Bull, but thankfully it does not.
The only noticable aftertaste is that of the berry-like puke flavour, which -- as an aftertaste, at least -- isn't totally unpleasant.
It's not entirely bad. For something with all the ingredients of Red Bull, a name that begins with "Red", and a colour that looks like someone's been punched in the kidneys and taken a nice long piss, it's decidedly palatable and probably earns itself a place on the short list of energy drinks that don't make your soul depressed.