I just finished it this morning and will hopefully be able to give you a full review later, but this was a fascinating look at who was John Wesley in the context of "the long eighteenth century." It looks at points of Wesley's theology (Trinity, Sacraments, prevenient grace, justification and sanctification) in light of his ecclesiology ("A Church of England Man) and his politics ("you cannot love God if you do not love the King."). It covers a broad spectrum of issues, but really focuses the reader on understanding who Wesley was in his specific context of 18th century confessional England. I highly recommend it.
(plus Vickers is an NTS grad)