I too have had excellent results with Memorex on both my MTU Plextors, but somehow still feel more comfortable when burning cdg to use Mitsui. I guess since there are jillions of Memorexes on the shelves I wonder if they from time to time get them from wherever they can to fill their demands. That's why I stick with Mitsui for CDG. A good workable compromise for me has been to use Memorex for audio and Mitsui for cdg. Am also having as good results with Memorex CDRW's as any other's I've tried, and they will now write at 4X.
Tak care,
George