Association Subscribers Manager 3.0 release date is close (within a month).
There is thing that still need works, like the license system. This one is not yet ready for a production release since it changed (again) recently.
One problem met by users of the older version of Association Subscribers Manager (2.x) is the data migration problem. Licenses were identified as string labels (until very recently), and this make lots of problems occurs as soon as those labels changes.
The new mechanism use IDs to identify a license and labels are just used the way they should be use : as information strings.
Those modifications should be available in SVN trunk at revision 257.