It was excellent. McLean essentially does a one-man show (there is a second character, a demon, who doesn't have any lines and essentially acts as a mime). The letters are edited down for time and dramatic effect; however, the lines are true to the book and McLean has a rich enough voice and large enough stage presence to pull it off. If anyone is in the New York City area, this would be a good play to take in.
"Be of good comfort, Master Ridley, and play the man! We shall this day light such a candle, by God's grace, in England, as I trust shall never be put out."
--Hugh Latimer, October 16, 1555