David writes a readable book and some of the insights in here are extremely powerful. David is not himself a neuroscientist and so his book is written from the perspective of a business coach who is intrigued to see how understanding the functioning of the brain can help people best manage themselves. I would personally rate it 5 stars execpt for two small caveats. One is you get a sense that in order to make his points clear he sometimes makes them overly simple - thus losing, on occasion, some important nuance. Secondly he does occasionally mix in some of his own theories (not proven using neuroscientific techniques such as fMRI) but does not clarify which findings are scientifically proven and which may simply be theories.