I just reviewed the lemonade flavor (
Amp Energy Lightning), and like
lordmadone, really enjoyed it. I expected it to be more on the side of yucky lemon-flavored drinks, but the infusion of the lemonade flavor was pretty solid.
It is interesting to note that with the rollout of the new flavors, the Mountain Dew branding has been completely removed from the product (though this may have happened earlier in 2008... I know when Elevate/Traction/Relaunch hit last winter, there still was a small Dew logo on the labeling)
I haven't had a chance to try the Green Tea or Black Tea yet... trying to track those down.