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The 'New and Improved' flavors are terrible. If you can find any of the old formula kicking around, go for it. I'd give the old Nuun 5 stars, but the new and improved stevia formula doesn't even deserve one star. Also note, the old bottles contained 12 tablets, while the new bottles only contain 10 tablets.
I have been drinking mass quantities of nuun for the past few years. I love it. It keeps me out of the hospital. The new sweetener tastes just awful. I had my last tab of original immediately followed by a tab of the new formula in the same flavor, and almost couldn't drink it. I need a lot of fluids every day as I am prone to heat exhaustion. I have enough original to get me through the summer, after that I'll have to figure out something else .