I saw this guy when I was in CA to see Arnett in 2016. I was sceptical too but thought I may as well see him whilst I was doing the rounds of a few CA surgeons.
I can't remember exactly, without digging out the paperwork, but I think the cost was around 100k US. So irrespective of anything else, that was me out!
I didn't come out with a better understanding of the process than anything that has been posted here - all I even remember was just that he emphasised that they do not grind down teeth like with veneers. Other than that I am still in the dark as to what the hell he does. I very much got the impression that everything he was saying was just regurgitation of sales patter he says to every patient. He was friendly and warm, I just didn't feel comfortable with any of it, considering this was my entire mouth of teeth and a cost that was astronomical. Plus, the teeth in his after photos do look pretty fake and plasticky. It would look ridiculous on my face.
Even if you ignore the above and could afford it, I think there is a limitation as to what it can achieve and who it can help anyway. Just imagine spending this amount of money and then realising after that it hasn't really been a substitute for jaw surgery. I think the truth is there is no real alternative to jaw surgery. If you need it you need it. You can of course choose not to have it and live with your face, thereby avoiding the risks that surgery entails. But IMO you aren't ever going to be satisfied with masking procedures if you have true boney issues and imbalances.