I've worked with this book, this method, for a lot of years. When it comes down to all the qigong I've worked with, this is the one I come back to again and again. I did it for many years, then stopped my daily pattern at some point in the last three years due to stupid reasons like excess stress. Which should have had me continuing, but I decided to go comfortably numb instead. Not a good thing, but a survival thing.
As the stress has continued in my life and caused more than temporary increase in health issues, I've realized I need to go back to what works. The clearing exercises in this book. Profound if you do them right. Profound even if you do them partially right. No reason not to do them!
A workshop with Frantzis is great, but know he can be larger than life. He'll tell you that himself on his website.