Low calorie, natural taste. I can drink this all day in any condition (hot, cold, etc) for a short ride or greater than a century. Most drink mixes bother my stomach or I just get sick of drinking them after 5 hours in the saddle. Nuun goes down easy and keeps me hydrated
I used to love Nuun, but their new formula with Stevia is not an improvement. The tablets are quite a bit thicker, so there's now 10 per tube, rather than 12, and they seem to dissolve more slowly as well. The big problem, though the flavor (or lack thereof). I tried both the grape and the berry and they tasted nothing like the old versions, bland and slightly medicinal (there didn't seem to be much difference between the two).
Very disappointed. I guess I'm going back to Hammer Endurolytes Fizz.