It's a good book and makes a compelling argument for the relationship between the ubiquity of paedobaptism and the universal propagation of the state church as a cornerstone for magisterial thought across Continental Protestants and their subsequent persecution of the Anabaptists. It also charts the development in Presbyterian and Lutheran thought on the subject of baptism's timing throughout the Reformation.
Its let down by its breadth and lack of sourcing, at least in the edition I read, and for this reason despite the extensive quotations is unlikely to change anyone's mind. Another major downside is the closing chapter then compares John Calvin and Wesley very superficially, I'm not sure for the reason of this grouping. The treatment of them is too brief to be useful too. It would have been better served by keeping the scope tighter and forgetting Wesley altogether.
I did learn a lot from this, particular the idea of how important a notion of a 'voluntary principle' was early on. Something most people take for granted now across the West but was forgotten as the Reformation progressed from its early days.