I do run AVG however I rarely run a scan. If I do feel the need to look for virus/spyware I'll run MalwareBytes - AntiMalware program. It's the best I've ever encountered.
I myself haven't used antivirus on my home computer in years and years. All you need is "Internet Smarts" Much like Street Smarts you wouldn't go walking down a back alley at 2am in Compton yelling out I HATE BLACK PEOPLE while holding a Wad of Cash and wearing a KKK Cloak and hood
My version of CommonSense comes bundled with AVG Free.
All I use is the resident service, I don't think I have ever ran a full scan with it. The resident service has saved my computer a few times, but sometimes it can be a pain. When my PC boots up, the resident service uses all of my CPU. Very inconvenient.