Measure of success
 

my newsreader showed 30 messages not downloaded,
then filtered by the rules I've added.

5 messages showed up here, all related to SWL.
83% deleted automatically

I haven't kept track by numbers like that before, as I add
a few more filters each week, and there are quite a few
more to d/l the first time I load the newsgroup each day.
But I have noticed that most of what I see is related to radio or electronics
now.