Well I was reading the forum and I couldn't evade commenting over it, I used to use avast "version 5.1 I guess it was." then I switched to ESET, ESET was purely based on heuristics "No more than 2 updates per day" and I didn't like it, then I went for Emsisoft, nice IKarus engine, but lots of false positive, also behavior shield was annoying, so then I went for KIS 2011 "In that time" it was pretty cool but its heuristics was kind of poor, purely based on its virus definition updates, so after that I went for Bitdefender, great detection rate, but my computer couldn't handle its system requirements so I had to uninstall it from my computer, then I tried trying NIS and it was good, but its GUI was kind of complicated to use, to many settings and after a year I unistalled it, then I started to using underrated AV products, I tried Coranti, but its 4 engines were outdated, I went for Outpost 7 which was very good, but since it was based on Virusbuster engine, almost all of the detections came from behavior shield, not a very good av engine, then I tried Trustport and F-secure, Trustport was heavy as Bitdefender, it didn't feel my specs, and F-secure was doing good till I got a dropper who killed it and deleted my program files directory, then I started to miss Avast GUI and performance, its simple settings, etc. I installed it again and it was now on versión 6 or something, it was amazing, after testing many AVs I couldn't feel better than using Avast.
Anyway, now I'm using another av for security reasons, since I'm working in a dangerous environment I need a "Paranoid" behavior shield, I'm not telling the name of the AV of course, this is Avast's forum so I won't, but for real, Avast is the best for common and world use of the computer.
Happy Christmasm and sorry about my poor english...