I voted colordmd because it makes such an improvement on Stern games. The red dmd just looks so bad in comparison. I have colordmd on my MET and cringe whenever I play another MET without one.
Regular glass seems perfectly fine to me. I don't think I have seen pdi/invisiglass so maybe seeing it would change my mind. Glare from dmd only an issue on a few of my games and a $15 glare guard from Comet fixes that. Pinstadium also seems like overkill on a modern Stern game that is already plenty bright.
It would cost $3000 to put the glass and pinstadium lights on all 5 of my games. Just don't see the value in doing that.