I found Chadwick's work to be a masterpiece and highly enjoybale. Every area of his scholarship (both from what I know and what others have written concerning his works) is as near perfect as can be. This is a standard work in most seminaries and is a must read for any Christian serious about their Faith.
What he explains is neither Roman Catholic or Protestant, he explains the Church like it was and still is in the Orthodox Church which is really shocking for RCs and Protestants that it wasn't either way but rather just how it is, if they know about it, in the Orthodox Church. That there was no Sola Scriptora and that the sacraments and lituragy were an integral part of Christian worship from the time of Christ on is odd for most Protestants of a non-traditional background.
For the Roman Catholics it is shocking to find out there was no Filioque or the theology which goes with it and that it was actually condemned by the Church at the city of Rome from the beginning of its introduction. Nor was there anything like the modern day papacy. That in fact, the Pope was just a bishop among bishops, all he could do was rule over the city of Rome just as any other bishop and could give a judgement to two bishops if they both decided to appeal to him to solve a minor problem of jurisdiction (a primus interpares), there was no Papal infallibility, cardinals, madatory celibacy for the priesthood, purgatory, etc. and how the "Rock" Christ says he will build His Church on, when read in Greek, is not refering to Peter, but is refering to his proclamation which all Church Fathers, even Augustine agreed on.
As a convert to Orthodox Christianity I was not at all surprised to read what I read, even though it's from an Anglican who still manages to surport Orthodoxy simply through telling it how it is.
I highly recommend it, short read, full of important and integral history to Christianity, a must read.