I first tried Monster when it first came out, when there was only one flavour. I thought it tasted like... have you ever eaten those Soda Fizz candies? It tasted like the insides of those candies, only liquefied. It was disgusting and I've never tried another Monster product since, even with all the new flavours.
I haven't had an energy drink in a really long time, actually.
Full Throttle Citrus all the way, though. I can't get through work without one and I love the taste.
Plus it's one of the very few energy drinks made without sucralose/splenda. I used to drink a lot of the grape NOS, but even the not sugar-free ones have sucralose in it now (they used to not include sucralose). Everything has goddamn sucralose! It makes me so sick and gives me the worst migraines.
Even the original Monster flavor now includes sucralose. I couldn't drink it even if it didn't taste like candy sludge.