I have a sensitive stomach and have tried just about every other sports drink out. I love Heed. It never bothers my stomach, tastes relatively good, and seems to do what it's meant to do. I've yet to try the plain but the Lime is good. The orange tastes like a creamcicle(sp?) pop but I prefer the Lime. I've used it for the past 3 years and can't see any reason to switch to another brand.