Everyone should be on a layered defense solution. With avast I certainly made my choice via a custom install.
Keep your OS and Third Party Software installed up to date and fully patched and use a normal user account.
Know that a sandbox will not protect you against all that comes in via the Network.
Use a decent in-browser protection that allows you to block (mal)-ads, unwanted scripts and third party requests.
(ABP, ScriptSafe, Ghostery for Chrome, ABP, NoScript & RequestPolicy in firefox).
Use the avast shields in combination with decent pre-scanning.
Additionally I use SAS and occasionally latest versions of AdwareCleaner and junkware remover and CCleaner to cleanse the temp files.
Furthermore some experience and common sense about threats to avoid and what one may encounter online.
This combined with what I learned online here in these forums to keepsme and my computers and peripherals secure.
So mix your own security cocktail and defend with your own brew.
Never combine two residential anti-malware programs that start to bite each other (two resident av's is a complete no-no).
Know that avast! still is a helluva av solution, unless tweaked properly and running on a non-compromised OS.
Just recently we had a victim that even had the OS downloaded and installed via torrent piracy. There we cannot give
any guarantees of course and we cannot help such clowns, that put themselves and others at risk.
But I agree with those that are fed up with bundled "60 seconds av-scanners like Bitdefender's and McAfee's,
run into the ground web rep like McAfee SiteAdvisor, nagware like Grimefighter in avast! free.
Tracking blockers that forget to block Google tracking and the so-called non-unobtrusive ads.
DrWeb's has a very good record for not bundling nagware and crap,
only minus for their extension is the pre-scanner does not scan deep enough
to not miss a lot.
polonus