A few months ago browsing google images (cats – for my wife!), clicking on one, AVG warned me it was an attack site but didn’t stop me getting one. I guessed straightaway as the box was running slow with huge CPU usage.
Made sure definitions were up to date and scanned with AVG and MBAM – nothing.
Almost as an afterthought I DL latest version of Ad-Aware (big changes since I last used it).
Surprise, Ad-Aware found a Win32.trogan.
AVG was free, but MBAM was paid for; neither stopped me getting infected or finding it afterwards.
I lost a lot faith in MBAM after that.
Having asked my local (highly qualified and experienced) comp tech, who in the past had previously been non-committal over which AV to go for, he now unhesitatingly advised on Avast; so I paid up.
Not only has Avast never failed me yet, but it found a malware.gen in an archive file that I did already know was infected. The point is, that file has been on my box for over three years and no other AV has detected the malware in the past.
Well done Avast.