Avast 5.1.798 is working well here, only a few issues mentioned by others, but overall good.
I made an installation from scratch...
I'm using the Spanish version, some texts aren't translated yet (I hope this will be fixed soon)
The Network Shield and Webshield weren't active after install (this solved after the first reboot, so no problem)
If i found some problem i'll report it.
Regards.