We used this small volume in a class on Revelation; the institution is what I would probably term "progressive mainstream," so very few of the students there held "rapture theology" in their belief systems. Interestingly, many of us found this volume to be rather insensitive. It is clearly geared to inform those unfamiliar with rapture/end times theology and confused by the popularity of LaHaye and Jenkins' series.
What the book does well: Flesher clearly delves into the history, albeit briefly, of end-times theology - from the earliest beliefs of the church regarding the second-coming of Christ through Augustine's "City of God," and fast-forwards to the 1800's when Darby developed a premillennial dispensationalist rapture theology (in which Christ comes twice and the church is raptured before the tribulation - a belief that was not part of Christian doctrine prior to this time). Flesher discusses Darby's work, coming on the heels of the French Revolution, and traces its movement to the US where it was popularized by various evangelists like Scoffield, and finally brought into the awareness of the masses by the Left Behind series, which soared into popularity after 9/11. Flesher synthesizes the various ways of understanding apocalyptic thought in terms easy to understand, even if they are a bit too restrictive in my mind. She also deals with the way in which the Left Behind Series interprets the book of Revelation, including the material that is actually not present in Revelation - she effectively demonstrates the way in which rapture theology synthesizes numerous scriptural passages throughout the Hebrew Bible (OT) and the New Testament to develop this particular end-times understanding. She clearly lays out the scriptural "cross-referencing" that goes on in the series - and how it is questionable whether or not this interpretation is appropriate given the context of the Bible.
What the book lacks: Compassion! While many folks who are raised from a more mainstream Christian perspective will find this book fascinating (and, perhaps, feel vindicated that LaHaye and Jenkins are a trifle off-base in their interpretation), it tends to commit the same error the author points out among those who believe in this sort of rapture theology. That is, it comes off, particularly in chapter 4 ("The Battle for the Bible") as exclusivist and impatient with "the other side" instead of recognizing that, whether the author agrees with it or not, rapture theology is an authentic mode of belief, one that, as a fellow student mentioned, is absolutely foundational to many a Christian's faith life - agree or disagree. Sadly, I would never recommend this book to more conservative Christian friends simply because, while some of the information is excellent, it is very insensitive. Shredding LaHaye and Jenkin's theology for its rather obvious logical and biblical flaws is one thing, but it would have been much more effective if the author more subtly offered critique of these flaws rather than appearing to simply discount all of the belief system. A perfect example is the end of the book when she offers only a couple of pages on how to respond to this kind of biblical interpretation.
Bottom line: The historical aspects of the book, as well as the biblical interpretation/history, are great though they could use about 50 more pages of explanation to be more complete. Those on the margins of rapture theology who want to "get" the Left Behind series will find it enlightening, though it's helpful to have read at least one of the books to really understand all her references. However, this is not something that proponents of rapture theology will appreciate. There is definitely room out there for someone to write something on a more appropriate interpretation of Revelation, Daniel, etc., without putting off the audience that it could help the most.