The factory settings are still alive and well in my amp. I can turn them on and off at will. Believe me, I understand the passion for keeping the factory settings. Whether I start with the factory EQ or with some other basis, I will use EQ to correct the anomalies I measure/hear and to implement a "house curve" that makes me smile. When I look at my final EQ and the factory settings, the basic differences are in the areas effected by the room. When I switch between factory EQ and my EQ, I hear the room effects. When I start with the M2 EQ and fix the room problems, the result us virtually indistinguishable from the EQ I made from scratch. It is clear that correcting a room with EQ can only make one listening position really great and others only better. That's OK for me. I reserve the sweet spot. At the end of the day, I'm not going to do much more in terms of treating my room. It's a place the kids play and the wife is comfortable. All in all, I like their company more than I like the relentless pursuit of audio nirvana. Thanks to all who have contributed.
All in all, the M2 is still way beyond my expectations. I couldn't be happier.