Tyll is the last person I'd accuse of selling out. He's one of the few reviewers I read and listen to. Having said that, I often don't hear things the way he does. But that's fine. Use honest, educated opinions like Tyll's, use your own ears, use whatever metrics and science you know, and put all of that together to guess if something is for you or not.
Changing your mind in this hobby is a pain in the ass. The internet remembers everything you say and nobody realizes that the situation in the real world always changes. So if you say A and a few years later you say B, people will assume you either sold out or have no idea what you're talking about, when in truth you're just being honest about things as you see them at the moment. It's one of the reasons why I don't post about headphones much anymore. But then again I have nothing to post anyway, though 10 years ago, that didn't stop me.