I enjoyed readings this book a lot for a number of reasons:
[a] it is not a typical description of Muhammad's biography and important events in Muslim history. Omid Safi described/analyzed major events by contextualizing them. For example, it does not just talk about when one of the major events in Muslim history took place. He sheds light into why it happened, what were its precursors, as well as immediate and long term implications for Muslim and non-Muslim world;
[b] Omid Safi makes great attempt to associate/relate major events in Muslim history with other world religions, Judaism, Christianity and Buddhism;
[c] Though it is easy to grasp Shia-inclination, I liked how Omid Safi attempted to explain centuries-long tension between Sunni and Shia Muslims;
[d] The style and structure of the book is unprecedented. For example, one of the sub-titles reads "Muhammad, Eric Clapton, and the Tale of Layla and Majnun"...
Please don't be discouraged that Omid Safi's book includes some depictions of major events in Muslim history. One of the reviews refers to this fact and apparently that made him give 1 out of 5. But that's the problem Muslims have. We don't look at the substance and overrule something based on what someone said or what illustrations it includes... I am Sunni Muslim and yet enjoyed reading this book very much, AND would gladly read new pieces of scholarship by Omid Safi.