"The Great Arab Conquests" is not only informative and enlightening, it's also a fascinating, fast-paced, and wholly understandable read.
I'll highlight just a few aspects of the book which I considered its high points:
Writing style. The author, Hugh Kennedy, writes with a style that is easy to follow and quite often fun to read. Many history books that I have read begin with a "Preface" or an "Introduction" where the author directly addresses you, the reader. But typically, once Chapter 1 begins, the author steps far, far away from you, the reader, to dictate events from some high "historical writing" platform. Kennedy stays with you throughout the entire book, offering insightful and sometimes even humorous commentary. It reminded me less of "historical writing", and more of some of those great, engaging history class professors I had in college. More authors of history should write like this.
Organization. Kennedy's smooth and straightforward structure makes it a breeze to comprehend the vast and diverse Arab conquests. The conquests are divided up into separate chapters for each geographical region conquered (e.g. "Conquest of Iran", "Conquest of Egypt", etc.). Each chapter is roughly 30 pages in length which always felt like the ideal amount of material that I could digest in one sitting. Some history books have colossal 60-page chapters, which have always felt exhausting to me. Other books have new topic headings every few pages, which I have always found distracting. Kennedy seems to have found an ideal middle ground, and it works beautifully.
Historical sources. The original contemporary Arab sources from the time of the Arab conquests are sketchy, and often nearly fictitious. Kennedy acknowledges this and deals with it in a superbly scholarly fashion. In addition to setting aside several pages at the beginning of the book to deal with this important matter, he continually wrestles with sparse and/or untrustworthy sources throughout the course of the book.
Maps. For every separate conquest region, there is a corresponding, well-detailed map. Iran, Iraq, Egypt, North Africa, Transoxania, etc. all have fantastic maps located at the front of the book. I was constantly referring back to them.
Finally, as a small but delightful bonus, the dustjacket illustrations of the hardcover edition of this book are absolutely gorgeous. The lavish Arabic design aesthetic constantly invited me to crack open the book every time that I glanced at it on my desk.
All in all, "The Great Arab Conquests" has quickly become one of my favorite books on Arab history. I was impressed by Hugh Kennedy's treatment of the Abbasid caliphate in his previous book, "When Baghdad Ruled the Muslim World", and this latest work of his has only increased my appreciation for his engaging, intelligible writing on complex topics in Arab history.