I'm not sure what Hernon was promoting as he never really said but he has no affiliation with them. What it does is it lets you know what alleles you have and how they effect everything from fat loss, metabolism, hypertrophy, caffeine tolerance, muscle fibers (fast vs slow twitch), lactic acid, etc (tons of other things). With all of this, it makes recommendations based on everything. It's hard to explain everything because it's so detailed but I'm glad I did it.
Would I say it's essential? Definitely not, but it sure is interesting