CMC and Daxon complete lineups are on the high priority list for two reasons. Firstly, there are liability concerns for a manufacturer of a backup drive that also provides media. T9 addressed Daxon Az2's playback and CMC's general data integrity issues. Secondly, they are business partners of HP, BenQ, and Philips.
Others are on the high priority list because they are popular items in stores.
Somewhere in the world, MBI, Nanya, Plasmon, and Postech are the cat's meow in DVD media. This might make no sense to Circuit City customers, but a popular electronics store "somewhere" carries these side-by-side with BenQ products, so they must be well supported or it's RMA-festival time.
There are incredible numbers of variables that go into media selection for a drive manufacturer, thus turning most listings into an invalid mess. BenQ addresses the issue by publishing a listing of media that has overspeed. This list does not match the list of "important" medias from their own marketing department. That's nuts! I think a different approach is needed.
Anyway, that's why I generated the short list at the very top of this thread--BenQ's most supported medias for now and for later.
I would like to improve it by decreasing the list to remove media that performs poorly with T9. A few newer media types could also be added.