I agree with APK, I don't think there is a "pro" CDr, but some are a better quality than others. If you are going to release on CDr then you should go for the highest quality. I myself use Taiyo Yuden with a white full face inkjet printable label. I burn the discs at 16X or less. I print them in a Canon inkjet printer, and this time printed all the booklets and tray cards on the same printer, would probably have been cheaper and less of a headache to outsource the booklets, but thats another story!
Taiyo Yuden seem to be held in high regard by many, and to date I have not heard from anyone who have bought my albums that have had a problem playing them. We may only sell small numbers but in my opinion you still have to be as professional as possible with everything, as if you were a major record company, not just an individual independant artist, speaking for myself that is.
I would think Projekt would be absolutely sure about the CDr discs used were of a good quality, as they have a big reputation to uphold, plus Sam has offered to refund money if the CDr goes bad, so he must be pretty sure they won't.