I have used the lemon flavor and naked flavor as my only main nutrition on my last few 70.3 races and like it quite a bit. My plan is to use it in my next full iron as my main nutrition and maybe supplement with either on course stuff or maybe some sort of carb mid ride. I have my nutrition (at least for the 70.3) dialed at this point with tailwind and I do add like 50% more salt to my liquid fuel. It seemed to make a huge difference to my performance, but otherwise I utilize what is on course and have had great results.
Typically I run 1 or 2 concentrated bottles and then have space for water or whatever is on course in the BTA. I have done a mix as well in the bta which i like better but I can’t easily mix with water at aid stations, so I think this year I will run concentrate and BTA with water/on course stuff. Otherwise it has been perfect to me. I have basically gone 100% liquids with tailwind and its much better than gels and easier to do than solids. No issues on the gut for me. I suggest trying their flavors and seeing what you think. I like the lemon and naked equally. The naked does have a weird flavor but it is not strong, and neither is the lemon. Much easier to get my calories without feeling like vomiting due to how mellow the flavors are, even concentrated.