After so much unidirectional mudslinging, this was really productive. I'm not technical enough to understand all the finer points being made but I still have a much better understanding than I did before, and in cases where the two of them agreed I can be fairly confident that what was said was true.
I'd love to see more of this. This was just two individuals arguing certain points within the space of an hour; no doubt two others could illuminate the debate further from their own unique perspectives.
I thought you did a great job keeping the conversation on track and otherwise being mostly invisible, which is exactly what a moderator should do. Thank you.

