Recently I presented at the Drupal 414 user group in Milwaukee on "Drupal Commerce, Deconstructed" to break down what makes Drupal Commerce and better explain some of its inner workings. The goal isn't to blow the minds of advanced users, but to sell it to all on its flexibility and help users understand why certain things are how they are. I've also submitted it as a session to DrupalCamp WI 2015.

Links to the slides: http://mglaman.github.io/deconstructing-drupal-commerce/#/1