I am an avid listener. I listen between 75-100 hours per month on my iPhone: 60% fiction to 40% non-fiction.
I think this short read helps demystify great dialog. As a writer, this book makes you think about technical writing issues. As a reader and consumer, this book helps you become aware of the rules and guidelines of dialog.
Bernhardt, divides things up into bite-sized chapters and provides exercises at the end of each for the purpose of honing skills. He avoids lengthy cut-and-paste examples and instead focuses on concise examples. I believe any series reader or writer will benefit from this work.