Edit: Thoroughly postmodern isn't really what I had in mind. I think it's noticeably influenced by postmodernism, specifically that politics and power are paramount to all things. Any choice of representation, therefore, is at its root political. The final chapter tries to move away from that in some respects, but I believe the opening chapter and narrative sections highlight that postmodern (for lack of a better word) thinking.
This was a massive tome (800 pages of text and another 150+ of sources/ bibliographical material) that was at times a slog to get through. Not to say that the writing was poor or anything but in a book this size, there will be long stretches where the content drags. My problems with this text are less in the conclusions but more in the methodology. The authors concluded their text by hoping they have laid down to rest the traditional understanding of the Iconoclast Era. I don't want to say they entered their work with that already decided but that their harsh textual criticism of the written sources tended towards the argument being in their favor from the get-go. They relied heavily on the work of Paul Speck, so I can't comment on the source criticism in particular, but I think it's a worrying trend in modern academics that we can't know anything about the past because everything is about power and relation to power. They give a brief concession that one shouldn't discount religious/ theological motive but are always quick to suggest a political/ economic motive (despite the absence of anything in the sources that would suggest that beyond conjecture.)
It's a thoroughly postmodern, to use an over-used term, look at the past. But the authors clung to an outdated materialism at the same time, that the only things we can "know" about anything is physical. This is represented in their choice of topics in the second half of their work. There the focus was on seals, coins, and archeological remains and other physical markers.
There were many good things about this work, and anyone interested in the period does need to consume the narrative portion at least. In particular, their contention that Leo III was not as committed an iconoclast as later sources make him out to be interesting and fairly well backed. Also, the repeated emphasis that Iconoclasm did not cause widespread support or revolt for the majority of the population. Genuine support and genuine resistance could be found in Constantinople but the majority of people kind of went with the flow. The second half of the work focused on different aspects of the Byzantine state at the time and while I couldn't tell you anything about the economics chapter, their analysis of the development of the themeta was excellent.
For anyone wanting to hear from the authors mouth, Leslie Brubaker recently went on "Byzantium and Friends" to talk about first Iconoclasm. She comes off rather smug but covers a lot of the narrative portion of this work without some of the in-depth source criticism. In the final analysis, "Byzantium In the Iconclast Era" is the definitive work on the subject but has serious methodological/ historiographical flaws that while neo-liberal academia might not see, the text operates philosophically in a weird area where they accept some of the claims of modern theorists about the past while refusing to acknowledge the conclusions from those claims. Its an incredibly weel researched text and one that has given me a lot of thought. It was not an "enjoyable" read in the classical sense but an incredibly valuable one.