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The book has great reviews and Angela is a recipient of the prestigeous McArther Fellowship, often referred to as the "genius grant". The book discusses the relative importance of talent versus grit in achieving success. Talent as measured by SAT scores, or other means, only correlates with success if accompanied by grit (passion and perserverance) and you can achieve success even if you don't exhibit alot of talent but have grit. The book advises that you not be so impressed by raw talent because that raw talent may not lead anywhere without grit. The book is a useful examination of what grit is, how it is measured, and what it correlates with.
Angela did a recent talk at Google to promote her book and you might want to watch it if you are unsure whether you want to read the book.
I'm only a couple of chapters into the book so far so can't provide a full review here, just a recommendation based on what I've read so far and the buzz that is accompanying the book launch (e.g., Google usually only invites higher profile book authors to present and the views on her talk so far are higher than most Google Talks). Given the relationship between grit and success, I think most entrepreneurs might want to examine this relationship in more depth for motivation and insight into the "science of success".