Well, I won't blame AV comparatives, since I have tested many AV, they have very accurate results by the way I had similar results to theirs, but yes, they are just tests, and tests can't be accurate when we talk about day to day usage, world common use of the computer, but yes if you go to mdl, malc0de, scumware, malwareP, and you start testing zero day files, well you may get a different result than what you were expecting, where high heuristics will have advantage to signature based and etc. As I said, its all about usage, if you work at a very dangerous environment then you may need some very good behavior shield and very high heuristics system, at the cost of some fake alerts, and of course even so, you won't be safe at all ; ) in my case I use two different av who can work at the same time with no problem, but cmon, for real usage go for Avast! for real ; ) best best, trust me, I have tested many suites so I know what I'm talking about.