Avira Free Antivirus 2013
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Full user review
"Seems good so far."
Seems relatively stable with a clean GUI design and appears to work well, although I have not performed any benchmarking yet (and may not have time in the future).
The Cons I've noted so far relate to the frequent (in my opinion) and obtrusive advertisements for upgrading.
Seems good so far. If you don't mind frequent and obtrusive advertisements or are opting for the paid version give it a try.