Just so you know: This is a collection of essays, all of which have been written by different specialists. The list of contributors looks first rate. Most of these authors have passed through Harvard and/or Dumbarton Oaks, which means most of them are quite qualified, but also that most of them use very similar methodologies (it's like a who's-who list of a certain club/school of Byzantine history).
The book claims to be a people's history (i.e. an account of what normal people did/how they experienced their faith on a daily basis). I suppose it could be, but, based on what most of these scholars have been publishing for decades now, I would venture to say that the essays are heavily influenced by modern theories of hagiographical construction of religious identity, as well as interpretations of text as space/architecture. Sure, that's a kind of socio-cultural history, but in a particularly Peter Brown kind of way (I'm not saying that's bad -- by no means!! -- but it's simply a methodological category).
If this sounds interesting, go for it! Just realize it's on the scholarly side of things. I'll probably buy it once the major journals run some reviews.