For those with a permanent internet connection, and who have streaming updates enabled, there is probably little risk, HOWEVER, for those who DON'T have a permanent internet connection, and thus don't get the streaming updates, or for those who prefer to have streaming updates turned OFF, and either manually update via the program, or download the VPS updates, then Avast 2014 would not seem to be a safe choice for an antivirus system.
It is now 19/11/2013, and there has been no VPS update since 131116-1. I personally think that is rather poor.