I think avast! has a lot of features that ahead other antivirus software so now it's probably the time to concentrate at heavy improvements in detection. Actually, avast! now has a good overall detection rates (90%+)
but that seem to doesn't matter when compared to overall response time so some kind of proactive detections are very facinating to avast!.
I hate to see that the potential customers simply underrate avast! because of it lacks so-called heuristics.