I have got a spindle of Bulkpaq Prodisc S03 DVD-R media. When I burned them on my ND-2500A with HP bitsetting firmware 1.07, ALL of these media contained "unrecoverable read errors" after about 3.8 GB.
This has now been solved by Herrie's beta7 firmware. I just burned a disc of the same spindle and had an almost completely linear graph in CD Speed. My Toshiba SD-M 1612 DVD-Rom was used as a reader and the reading speed was 12x.
Since I am not interested in speed, I'll burn them @4x. That's enough for me. My recommendation: The writing strategy for S03 media is perfect in beta7. Herrie can take it for his new firmware releases.