PacoTaco
500+ Head-Fier
That is a really simplified dismissal of a dude that's probably touched more gear then anyone here. I don't agree with all of Zeo's reviews but I have no doubt at all that he reports what he hears. Which is a whole lot better then a lot of the powers that be even on places like Head-Fi.
Dude isn't making any money of 20k youtube subs and amazon affiliate links. Trust me on that. Also he hates the M50s and his review is a bit more nuanced then that.
The fact of the matter is that unless you are using extremely expensive gear it's not all that likely you are going to hear any difference between any Schiit DAC and the ODAC. Why do you think DAC reviews are so nebulous in the first place. They measure past the point of being audible and any differences you do hear more then likely are from the analog stage anyway.
Anyway I respect him for the same reason I respect MLE. I feel comfortable knowing he reports exactly what he hears and I know he's used a lot of gear. Not much more you can ask for.
He use to hang out on the headphones subreddit recommendation thread and only post headphones he linked to his amazon affiliates crap. That's the issue with it. It's a very large ethical issue. I also hate the M50s, but because they're incredibly V-shaped and not neutral at all, which is the complete opposite of what he stated (and my opinion is by far the more prevalent one...not to mention the more measured one.) Because he provides affiliated amazon links for headphones he listens to, that brings to question the actual authenticity of his reviews (because no one can say 100% he doesn't have a slight positive bias if he's going to end up trying to post an amazon link to the headphone.)
I won't even go into the DAC thing, because that will lead to a whole huge argument that is completely unnecessary in this thread. But, nonetheless, he is not a reliable resource, despite how much gear he's listened to.