5 stars, really. Come on. You already know a lot of stuff from this book, so why 5 stars?
First, it's good to be reminded of some thing again and again because we tend to forget things, even important things.
And I mean, a productivity coach, who already mediates and takes care of himself and who still suffers from anxiety and burnout and then tells you to focus on being calm instead of being productive? Sounds more like a novel than a non-fiction book, doesn't it? :-)

I picked the book up because I was pretty productive but I wasn't very happy. I wasn't very stressed, at least not in the common sense of working too many hours and so on but I wasn't calm either. I was overthinking a lot.
The book helped me, combined with other changes, to focus on what's important for me.