Agree, as Alwil submit Avast4 to the V100 test, you would expect it to achieve the benchmark. So now it has missed as it has before, what are you going to do, stay or go?
Me, I am going to stick with Avast, I have tried some of the others and had various problems, with set up, or scanners causing system crashes, or slow running, or I simply did not feel safe. Now this is where you and I differ I have based my decision to stay with Avast because of my passed experience, when Avast failed the V100 test before was I infected, no! Could I be infected, yes of course I could, but there again what are the chances?
No scanner is an 100% guarantee that you will never be infected, I suppose logicaly you will argue that because it failed a list of know viruses my chances of infection are greater. Okay, I agree, but look it missed one file, and what about the staus of the Wild List in between the V100 tests, does it not grow daily? Just because an Antivirus product caught all of the viruses on a certain day does this mean it is 100% safe until the next test? Of course not, you will still have have to make a judgement by looking at the list of scanners that made the grade, consider the product history and how many times it won an award, your own circumstances and critera in order to make a decision!