I am using 2.18 firmware and I dont' believe it is modified, even so I chose to burn at 4X and these discs are supposedy rated at 8X anyway.
I'll be posting my scandisc result in a second.
rdgrimes, I don't doubt your results (you probably got a good batch like some people have) but based on people loving and hating this media my bet is that it is the media given my experience with inconsistent quality in ProDisc CD-R for years.
I have in the past burned lots of different media with modded firmware and never noticed a difference either way except that you had the possibility of burning discs faster than you probably should
RDGrimes if you can let me know what NEC firmware you used (assuming you've burned these disc in NEC 3500A and not just Lite-on) I wouldn't mind trying it to see if your theory is correct (eg. if I burn with your firmware and the results are good ....at least no unreadable sectors) we'll know it is not ProDisc but I think it is just normal inconsistent ProDisc quality.
Cheers and for now I'm sticking with the equally affordable and more reliable Maxell RICOHJPN01