As I posted previously, I trust them, and posted them because they all came from Anti-Catholic backrounds, prior to the study of history, philosophy and theology, coming to the conclusion that they could no longer support the previous belief systems. Louis Bouyer, was a Lutheran Minister prior to his conversion. His book, the Spirit and Forms of Protestantism is a very good review of the issue.

The only one I would warn you about is John Henry Cardinal Newman, is one of the most respected scholars and writers of the 1800s in England, I do think he is a little harsh in his treatment of Martin Luther, he tends to put his personal opinions in his treatment of the subject, and is not as objective as the others.