I’m one that just can’t do it. There is a ‘mouth feel’, and the taste, and aftertaste (and burping) that I’d rather pass on. (I can’t stomach Gu stuff either, but that’s because of cramping stomach)
The flavors are ‘off’ too, and yeah, now with so many strange colors, I’d rather pass just because of that. Anything with red in it that’s not ‘natural’ is suspect to me. Most (all?) of the red dyes are cancerous at some level.
One thing that peeked my curiosity was Tang, like a big hit when I was a kid (those with Space Food Sticks: and if that combo didn’t upset your stomach, nothing would) but had some a few months ago, and it was better back then, like most things I guess… 
It’s good to have a selection for people. If it was all Gu stuff, I’d have to do without.