Great to see this on here! Since I've started listening to it, I go around recommending the book to basically everyone. The truths in there are so simple in theory, but it's still eye opening to be confronted with them.
I really like some of the viewpoints and perspectives, but I found the material pretty thin and not worthy of an entire book. It's a dozen short blog entries stretched into several hundred pages of text. I recommend it as "skim in a few sittings" vs. read.
I think this happens with most self-help books. Most of the time it's just lecturing about a single point for a number of pages that can be summed up into a paragraph or even a sentence at times. Personally for me, the value of the long form style is that it allows the author's message to brew slowly in my head.