I do not intend to sound like a moron here, and if I do then please forgive me. Sometimes we have seen tests that occasionally gauge the unpack engine of various AV products. Due to various reasons, so far every test performed on this matter has been largely unreliable. Not that it matters a lot, but considering the amount of repacked variants making it into the Web today, I suppose a strong unpack engine (or at least good packer dependent detections) would make a decent difference in the amount of protection offered by an AV in zero-day. Now, some people at Malware-Test lab told me a little bit about why it is difficult to reliably perform a test to gauge unpack engines of AVs, but since Malware-Test itself is not highly regarded as a reliable organization, I would like to hear the points of view of the more established testers like IBK on the affair.