QUOTE(Bad_Ad @ Oct 13 2011, 12:26 PM)

Could be sony. The sony optiarc drives do the best burns on DL verbs. Better than all 3 of my pioneers (112, 215, 216).
Yes, I am one of those people from cdfreaks that does scans of media - so I know its the best of the 4.
Pioneer is better for all other media tho. (and is still fanastic for the verbs, the optiarc is just better)
Liteon's are pretty shit writers - but they are amazing readers. (I have one of those too, just for doing the scans)
Finally, a post with some good arguments and a very plausible guess. I made the exact same guess and I indeed have had almost the exact same experiences too.
Before I read up on burn quality (quite some years back) I bought a Lite-On burner (which later luckily came in handy to make scans) and the burns from that piece of shit were so bad that the most picky Xbox 360 drives wouldn't even read Verbatims burned with that drive. Back then I still used a Pioneer (DVR-216BK if I'm not mistaken) and Verbatim burns from that one worked perfectly on every single Xbox 360.
Later I replaced my Pioneer with a Sony Optiarc / NEC AD-7240S, I'm still using that one and very pleased with it too, all burns still work perfectly and I've never had a burn fail.
I'm not really sure what the results on CDfreaks were anymore but I believed either Pioneer or NEC was superior in DL burns and the other one was a very close second (on DL burns) but had better overall results. So my guess was that one of these would be the one that C4Eva is making firmware for. But I also read in this thread that Pioneer no longer makes optical burners and in my country they are indeed very hard to find (as opposed to NEC burners).
Therefore my educated guess is that C4Eva is working on Sony Optiarc / NEC AD-7260S firmware. That one is very cheap and widely available and in stock everywhere. Also that drive has a couple variants, like the AD-7261S and the AD-7263S which fits with the story (that there are different versions of the model).