The weird part is that I had few problems with the 700MB CDRs on the original TurboCD setup (just the occasional reseek, but that can be normal even for pressed discs), but major problems on the black Duo. I did get Monolith to load once on the second try, and I got Mysterious Song to halfway-boot on the second burn but it wouldn't get past the title screen. And this was the best black Duo model BlueBMW had.
So hopefully these high-quality 650MB CDRs will give us some decent results... they damn well better because they weren't cheap.