I have studied his lesson material...even bought an ebook and video once a while back. The cost was insignificant. I am not a Klassen disciple but I do think some of what he says makes sense. The idea of swinging down a hammer behind my right side with my left hand is very powerful for me. It keeps me from casting the club and it "single-handedly" solved the reverse C I'd slip into because I was too much on balls of feet. For driver, I stand tall, keep weight in my arches, keep right elbow close, bring club back and make sure I extend my arms, have loose grip so my 50 year old wrists tilt the club closer to parallel than not and my only swing thought it driving my left hand down like I am hammering a spike into the ground. All of his other stuff like swinging to a target outside the ball, opening or closing clubface, etc. was just putting more swing thoughts in my head do I don't think about it. I get all I need off the tee and hit the ball down the line. I rarely need to work the ball off the tee but if I need a sharp fade, for example, I open my stance and clubface and swing away. That's it.
Weight in arches and hammer down. I agree 100 percent with previous post. If I knew about his simple explanations when I started, I would have saved a lot of frustration along the way. I don't know if he is still selling anything but it might be worth a peek