This is one of Osprey's better offerings in its rather short series of Byzantine-themed volumes. I have had complaints with some previous volumes, and I have some here, but they are sparser and less critical. I am no art critic, but I really have to praise Guiseppe Rava. The plates are loaded in brilliant colour and detail. From another reviewer here, I understand that Rava received some criticism for his earlier work on Dawson's Byzantine Cavalryman C.900-1204, but he has certainly stepped up his game. The illustrations are utterly fantastic, and some of the best that I have yet seen in an Osprey book. However, there is one small quibble with some of the visuals. The reproduction of manuscripts in Osprey volumes have presented a continuing problem. Too often they are lousy black and white copies of documents that were illustrated in many colours, and as such it is very difficult to see the fine detail. At times they are so badly reproduced as to be utterly useless. None here fall into the useless category - although some of the fresco reproductions sure come close - but still, these representations are a form of source material, and were meant to be viewed in full colour.
The actual content of the book is quite good. D'Amato benefits from some modern scholarship that was not available to Blondal when he wrote his The Varangians of Byzantium, especially in regards to archaeological discoveries of equipment. The text is well-balanced in regard to D'Amato's choice of topics, and everything from participation in imperial ceremonial to actual battle is covered, albeit very briefly. The section on the rhompaia is especially welcome, as the descriptions by Psellos in his Fourteen Byzantine Rulers are not consistent with other sources, however, D'Amato provides a good solution to this small problem. I only have one real problem with the text, regarding the composition of the guard. D'Amato stresses the service of Angles and Danes in the guard in an earlier period than has typically been accepted. Since this is hardly a serious dissertation on the subject, I can't be too critical of his ideas, but I'm not convinced by what seems to be a stretching of Anna Komnena and overemphasis of other, minor sources to support his thesis of more Angles and Danes than previously supposed in the guard. He also makes a mistake regarding the payment of the Varangians, when he states that they were paid in aureii. In reality, the aureus had ceased to be minted in the early four century. "Nomisma" is the term he was looking for.
All considered, this is a fine addition to Osprey's line of Byzantine-themed books. My reservations have been noted above, but they are minor. This book is brilliantly illustrated, well-researched, and provides nicely balanced introduction to the topic.