I have meant to get back to you with some feedback, but i have been too busy breathing from my center with ease to get to the computer! Honestly, though, the results have been just great (even though I know I'm not remembering some of the exercises correctly). My breathing is not at all trapped in my chest anymore and I feel very good despite a lot of stress.
I have been doing the PACE with my pre-schoolers for one week. I have noticed a considerable increase in their concentration abilities. They are very much engaged in what we do and even if the door of the classroom is open and the other kids are in a break my own students can still focus on what we are doing.