I was wondering what it tastes like. It's 35% whey according to Wikipedia, so I'm guessing that for "original" /"plain", it's watered down whey flavored? Seems like there are lots of flavors of it too.

Red, Blue, Green, Refresh, Grapefruit, Mint (Switzerland); Yellow, CLIQ Peach, CLIQ Rhubarb, Elderflower (Switzerland, discontinued); Original, Green tea, Cranberry, Pineapple, Raspberry (Netherlands)