it works very nicely! try it out: http://buildbot.spamassassin.org:8011/
it isn't yet pushing the results through to the rule-QA user interface at http://buildbot.spamassassin.org/ruleqa/ , but in the meantime you can see how fast it is by triggering a build and watching it mass-check 5300 mails in 1 minute ;) --j.
