Writing a review for this book is a bit like leaving a review for the Colosseum or Chichén Itzá... anything you say doesn't really have any weight because you are dealing with such an important piece of historical heritage, that it doesn't really matter what you think about it, since the mere fact that it exists is already mind blowing. We are so lucky to have access to this piece of history, written by arguably one of the greatest warriors that ever lived.
Whether you are a martial artist or not, whether you are into history or not, the Book of Five Rings has a message for everyone. Some parts may appear dry to some, but I would urge those people to take a wider interpretation of "the enemy". When you look at Musashi's strategy as advice to be used in the face of any adversity, and not just a physical warrior that wants to kill you, that's where this book really opens up as a strategy for the spirit. Keep the high ground in combat, look through your enemy rather than at them, hold your body in a way that makes you appear big etc.: these are more than just notes about war strategy, they are a guide for facing whatever life has to throw at you. They are pearls of wisdom of a warrior and can be applied to all sorts of situations. This edition also has a very informative introduction, which helps frame the historical context in which the scrolls were written.
I am undoubtedly biased, due to my love for Japanese martial arts and culture, but I genuinely think that this book can help reflect on a lot of the principles that martial arts teach: resilience, respect, focus, discipline. The fact that almost every paragraph ends with "study this well" or "examine this carefully" provides an insight into the warrior's ethos and the Japanese approach to completing tasks. This is a direct line to history and is definitely worth a read.