I couldn't decide if I would prefer these or the ExOfficio briefs, since both seem to have reviews that claim one is better than the other, so I bought both. I guess the Beast Anatomica have one more review for "these are better than Exofficio".
Don't get me wrong, I can see that in less extreme environments, the Exofficio's would be great underwear. But when it comes to consistent 110°, the Beast Anatomica keep me nice and dry, even after a 12 hour work day.
Size wise, I'm a 28-29 at the waist, which was another concern regarding the size chart, but the smalls fit perfectly.
These are the best underwear I have ever tried, and I intend to fully replace my underwear drawer with only these.