I'd second this. It really is a phenomenal book. For me, the most interesting thing about it is it would probably be a terrible meditation guide for a lot of people I know. But if you have the approach/learning style that's typical of folks on hacker news, it's the best book there is--because of its emphasis on clearly elucidated concepts, consistent use of language and terms, ample neuroscience-oriented background, and an "actionable" progressive approach.