I am practicing the Mysterytomastery method for ober eight years now.
One year before my masters degree I coldnt play any more, it was a total collapse, because of my wrong, stiff, tense setting from a beginning of my trumpet playing (because of buzzing), and like many trumpet players-overblowing.
My teacher once said to me that I shold look at Greg’s videos on youtube, and I did. Of course I was pretty dubious over that method at start. Then I bought both books and started to work and watched every video several times, so I slowly got a point of Greg’s Idea.
I must sat, that Mysterytomastery is the only method that worked and still is working for me, and becouse of that method I finally after 20 years of playing trumpet enjoy playing it and I feel comfortable and relaxed (not scared and insecure like before). And I must say now I am a teacher and I teach that way, and must say that a healthy and resonant sound is possible already the first year the student start’s to learn.
That is why I recommend this method for everyone. Buy it study it, stick to it and believe every word the Greg says. It saved my musical life.