[Exim] Exiscan vs. MailScanner

(Please excuse me if this shows up twice -- I previously sent it from
the wrong email address.)

Has anybody had any direct experience comparing MailScanner with
Exiscan? I only just heard of Exiscan and it looks like it will do
everything I need. Any pros or cons? Any benefits either way
performance-wise?

Thanks!

Take care,
Mike Oliveri