I've read Road to Manzikert in the past weeks and I think it is one of the best books on Byzantine and Islamic warfare available. The descriptions of the battles are clear and well-researched, supported by very good maps. The war in the east has come alive for me while reading this book.
I hope to see more work from this author (or must I say authors?), hopefully including a book about the period after 1071 and the crusades. I have only one word for this book. Superb.