I learned of this product from an ad and gave a sampler pack a try.
I tried several of the flavors cold. They are tasty, mildly refreshing, and also mildly thirst quenching. The latter 2 are bonus. There's also a mild flavor of the underlying caffeination that's very mildly bitter. The flavors themselves are more subtle than bold, which is to say, as an example, the Ginger-Mango is not overpowering but present enough to taste. Something else that's mostly mild is the carbonation. None of my comments should be construed as criticism or complaints. This are very drinkable!
I typically do not get a caffeine buzz, nor do I get jitters or any other noticeable effects. This product is an exception in that I feel a slight boost and alertness.
There's my impressions along with a recommendation for this product if you are looking for a drinkable and stimulating boost.
cheers