Another excellent article is Contraception and Conversion by David Mills. He begins by observing that progressive Catholics sometimes ask him why he converted - after all, the Episcopalian Church had everything: "married priests, women priests, homosexual priests, no doctrinal restrictions, evolving moral standards, and an official reason to be rude to the pope. What more could one want?" I found this section amusing:
I will often say, in as cheery, boosterish, and cheerleading a voice as I can manage, "My wife and I discovered the truth of the Church's teaching on contraception, and after a while we just had to join the one body in the world that was telling the truth about it."
That usually shuts down the conversation.