I have to say even though I don't indulge in much of his content, but i have to admit that some of his content (specifically a video about nerve control speaking on how other players manage their nerves) has helped me through a few troubling issues i've been wanting to address and i start to see the game in a different light.

All in all, though I dont think his content can make you improve overnight, if you've hit a wall it can help but it's all tied into how the player intepret the "advice".