hehehe, i use avg and i hate how it slows the computer down while scanning, but its free and easy to use and has the virus, spyware, rootkit and other tools....i only use it as convenience of not mixing up different programs....i dont see any problems as in it is bad or not.......i have used adaware and i think that is very bad......and i actually paid for it, it never finds much.......
i have never had issues where avg didnt fix....apart from some really bad virus that needed smitfraud to fix
but if you can recommend some good free anti virus, anti spy/malware and rootkit programs im sure averyone can decide on what they like best.