I did my best with it, but it didn't change my life. It was fine; sitting quietly for ten minutes a day is probably a good idea.
I appreciated that he tried to avoid using woo-woo language, but I often didn't understand what he was going for. That's probably inevitable: he's trying to induce a state that you can't get a feel for until you've done it. (I'm reminded of learning to whistle. I put my lips together and blew, and kept doing that until suddenly it worked, but I could not tell anybody what made that instant different.)
I will say, though, that I often thought "If Sam Harris heard some yoga teacher say that, he'd rip them a new one."
It is entirely possible that I'd see more benefit if I continued past the 30 day trial. Clearly it works very well for some people; I'm certain that there's a "there" there. It's definitely better than trying to gaze into my soul through the backs of my eyeballs (which I did in fact hear from a yoga teacher).