I get the general feeling that SpamAssassin really sux. I also use Gmail to catch some of the same mailboxes and Gmail is WAY WAY better in filtering spam.
The bayesian filter doesn't seem to work at all (yes, it is enabled). I get the same SPAM type (Rolex from Russia, using my own email as sender) since weeks, I always report it in usermin - and still it's not counted as SPAM. I would say the effectivity is about 50% (Gmail 90%)
I am thinking already of disabling SpamAssassin completely and have my mail run through Gmail.
I would really appreciate you suggestions on how to make it work better.