I've used all of the taggers listed, wanted to try Identify2 but the demo is no longer available from Macupdate or the developers homepage. My main question/concern is that iFlicks has a "Flatten to Quicktime" option in versions 1.2.x (not in 1.3.5 Beta) that quickly, meaning 6 seconds, tags the m4v files (from handbrake.) My experience with MetaX, Subler, Vidalin, have all been somewhere between good and bad. Why can iFlicks quickly tag the existing file while the other 3 apps have to write a whole new file? Is there something bad or a shortcut taken by the iFlicks method? Something that could be incompatible with future versions of iTunes or iOS Depending on the app and the file, the other apps can take between 2-6 minutes to tag and create a new file. What am I missing here? I'm not talking about remuxing but just tagging. Any insight?