I learned to see Bach as a man from this book, which has given me further insight into his music. I am sure this will help me with interpretation and expression when playing.
The book is fascinating, but is quite difficult to follow at times, as the story is not told in a linear fashion. A family tree (there are a lot of Bachs), a timeline for his career progression and a list of his friends, colleagues and fellow musicians would all help to make Bach's life history clearer. It's the absence of these details that has reduced my rating from five stars to four.
I had expected the book to be a difficult read for me, since I'm not inclined towards either history or religious music, but I found it engaging and hard to put down. I recommend it to anyone interested in either the history of the period or music.