This is a very dense book that covers the seven Ecumenical Councils in a fairly compact way. I liked the structure of the book, which introduced the background of disagreements/heresies leading up to each council, along with political situations in Christendom; the major players, topics of discussion, and anathemas resulting from each council; and the aftermath.
I am not familiar with the author, but his editorializing comes across as a Roman Catholic, and I am not educated enough to determine how much this biased his account. However, he included many sources, timelines, and important Church Fathers that the reader can easily check to confirm the history. From my laymen perspective, it seems the author -- at least largely -- represented all of the Trinitarian, Christological, jurisdictional, and iconoclasm controversies faithfully.
I would recommend this book to any Christian interested in early Church history.