dunno bout last one,
i recently ditched avg for avast
although i found with avg i never got a problem, when opening big files my computer would shoot to 100% cpu for a time, [avg may have been scanning it]
took a long time to figure out it was avg, i only realised when i switched and it didnt happen, thats my only issue with it
i think alot here prefer avast now,
as said, ive been running free AV for years, never had a problem, even using p2p sites and bittorrents like i used too.