I got the opportunity to view MM a few weeks back. I wasn't overwhelmed with the materials, but I ran through the movements while watching.
I've been feeling tight in my right hip/glute/lower back area for a few weeks, and after I ran through the movements in the first part of the vid it was gone, so that was cool.
The "spinal flossing" stuff is also detailed on T-mag in an article by Carl Valle and Mike Robertson called "The Superior Circuit", and there are 3 parts to the article...well worth checking out. I used to do that regularly, but had forgotten about it.
I'd like to check out I/O, because my lower body is pretty good, but my upper body is a bit of a mess.