@hikermor , I use it for when it's really hot out and I'm sweaty a lot.  There are bottled Gatorades that have lower sugar that sit better for me, but in general, I agree.  I once got a nasty migraine from some sort of prerun product before a half.  Everyone swears by Nuun, but I forgot to mention I hate the taste of stevia, which all the easy to purchase supermarket varieties seem to include.  Looking at their website, the endurance formula doesn't look bad though.  I'm going to add it to the list!