have no plans here on trying out the BETA.   in fact, I might even wait a few days (week+) after v6 is released, to allow OTHERS to be the "guinea pigs".

Known issues
- Help files not updated yet
- Localizations incomplete yet
- SafeZone not yet accessible (Pro AV / IS only)
- WebRep only available for IE and Firefox (Chrome is coming soon)
- Firewall: per-application packet rules not yet accessible
- Firewall: uTorrent conflict not yet resolved

having started on a negative thought, let me take another moment to "accentuate the positive":

The new avast! 6.0 will provide no-hassle ‘virtualization’ to all users, giving them even greater security. AutoSandbox is the first time that a free antivirus will offer virtualization technology together with outstanding malware detection.

http://www.avast.com/pr-avast-6-0-will-bring-automatic-virtualization-technology-to-all-free-users

Pretty much my thoughts too David, to let others discover the bugs and what needs fixin'.  Have been very happy with Avast 5.