Don't imagine that I actually know anything. I vaguely remember that there was a clashing issue that prompted his tests of the various free systems available, but, apart from the MSE MWB combination being the best result, I can't remember much else.
This is from a couple of years ago, but his opinions are unchanged today. http://www.staffordforum.com/xf/index.php?threads/which-anti-virus-my-findings.4314/