If you are a bit confused about what is Six Sigma and what is Lean, this book won't help you. It is a confusing read, but maybe a consultants wet dream come true: as you need one to understand anything after this.

If you want to understand what Six Sigma is about and get a bit of sprinkling from Lean, this may be for you. Otherwise, it is a pretty meaningless book, albeit written in an easy-to-read prose and not containing too many errors.