What can I say? Nothing I have ever read can compare to the collection and compilation of so many differnt church fathers, councils, and heretics. Anyone who wants to know about Christianity after the last verse of Acts of the Apostles needs to read this collection.
The first volume starts it all off. Have you ever wondered what went on in Christianity between the last verse of Acts of the Apostles and 1517? You'll want to read this one and when you do you'll find out that Luther, Calvin, and the rest of the "Reformers" weren't getting any closer to the original church and the teachings of Christ than the indulgence selling, mistress toting, warlord Popes of the time.
The Didache, Ignatius of Antioch, Clement of Rome, Justin Martyr, Polycarp of Smyrna, etc. are all featured in this collection as well as the decrees of Church synods and the Coucil of Nicea. After reading the first one, read the second and third, they're follow up on the church until the time of John of Damascus in the early 8th century