Wife hates it, my daughter has a crack at it...It's meditative, feels great when you get overtones, and feel the resonance in chest, throat and oral/nasal cavities.
It's a bit of control over systems that you normal don't feel that you have control over...like my quiet moment breath control and breath holding, driving through the normal reflexes. Can regularly hold breath for over two minute...3:07 is my best ever.
This guy does some good work..
I'll start another thread...