I'm currently running ASL 2.031 on a K6-500, and have been for more than 18 months.
I did not upgrade to ASL 3.x, as (a) it has no new features I needed, (b) it did NOT have banner blocking and (c) I didn't have access to a fax machine to get a power-user licence.
Now ASL 4 is about to surface and it seems that ASL 2 is no longer supported/actively maintained. Will banner blocking make a come-back in ASL4?
