Caught viruii that the others missed. Relatively better value for money. Minimal visible interuption to computer use.
You are forced to donate part of cost to daughter company regardless of whether you want to support it or not.
I have been using Avira for a few years now and am generally pleased with its performance after being disillusioned by Norton because it takes control of my computer away from me, by McAfee because of lousy after sales service, and by AVG because of their overpriced product. Each of these other brands allowed viruii into my system at one stage or another, only Avira has been mostly secure over past few years.