Avira has a really great detection rate, although whenever I used it i felt that the real-time detection kicked in too late. I think it needs an improved behavior blocker to become effective for real-time protection. But as a scanner I think it is excellent. I cleaned up many systems with Avira and whenever I used it first it did most of the heavy lifting, a few leftovers were picked up by Kaspersky, Avast, etc.