For me, its key feature was that I found it more actionable than other sources that I'd found online. I prefer it to 'Mindfulness in Plain English'. However, to be fair, I haven't read the entire text, so I don't think that I can make a fair comparison.
Edit: The author of the book is Culadasa (Dr. John Yates, PhD), whose profile mentions that he was a neuroscience professor at one point in his life. I haven't verified this.
Edit: The author of the book is Culadasa (Dr. John Yates, PhD), whose profile mentions that he was a neuroscience professor at one point in his life. I haven't verified this.
His profile: http://culadasa.com/about/