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Monster, Red Bull, Battery, Burn (I don't think you have the last two in the US), it's all the same crap! I usually refer to them as "canned puke", cause that's exactly how they smell/taste. They contain a stuff-ton of sugar and basically no coffeine. One cup of coffee contains more than one large can of energy drink, yet everyone seems to think that these are coffeine-bombs. They aren't. And they taste like stuff.
These drinks are immensely popular with pre-14-year-olds here. Since they can't buy alcohol, they drink this stuff and pretend they're cool. The result is a bunch of hyper stuffheads who think they're the coolest people ever. Luckily, they usually crash very hard after an hour or so, when the sugar high wears off.
Oh, and Red Bull is also very popular among teens who've managed to get their hands on some alcohol. They use it as mixers for their drinks. The only thing that is worse than a bunch of 14-year-olds who drink Red Bull is a bunch of 14-year-olds who drink Red Bull and Vodka. At least the non-alcholized bunch don't end up puking everywhere.
In conclusion: these should be banned from stores all around the globe, as they are disgusting and utterly useless. Real men drink coffee to stay awake and beer/straight vodka to party.
</rage>