This is a really good primer in Anabaptist-Mennonite history. Two things come to mind:
First, any attempt to write such a history has to deal with the issue of whether the word 'Mennonite' describes an ethnic heritage, or a distinct approach to Christianity—and if the answer is 'both', then how are they related to each other and how do we clarify, at any given time, which one we're talking about? In the earlier chapters of this book, describing the 16th century radical Reformation, it was fairly clear that a spiritual movement was being described. In the second half of the book, as the Mennonites migrated across the globe in the search of freedom to practice their distinctive way of life, it was not so clear.
Second, this book is now somewhat dated, as it was last revised in 1993. If it is to retain its usefulness, it needs a new edition to bring the story up to the present day. A lot has changed in thirty-one years!