Yes. He’s based not too far from me. I have spent around 20 hours with him over the last couple of years.
The technique he gets you playing is an interesting one. It certainly opens up the on-side a lot more, and you will end up nailing the ball straight down the ground. However, anything through the off side is a bit more difficult, mainly because there’s such a huge movement required to get in to position so you’re not just throwing your hands at the ball and hoping for the best.
One thing I really noticed (and suffered with badly last season) is that my left shoulder (I’m left handed) was opening up really early, and I totally lost the ability to play down the correct line. The net result being that I got bowled 5 matches in a row, each time playing inside the ball, when I usually get bowled no more than 1-2 times per season. I’m going to go back to my old technique this coming season, and see what happens. I like the idea of being a bit more open, but what he teaches is an extreme version of it.