Thanks for Your reply. Yes, I know the scans of the same manufacturer's different model drives can be different.
However, I am a bit amazed at the quality test's results, especially the 12x write speed one. I wouldn't think scanning this disc would produce much better results on any drive or am I wrong?
I tested some of my old discs, out of curiosity. Same model Verbatim (mcc 03rg20), but made in Japan produced much better results as did Traxdata, which is a cheaper brand.