Give me Mylar all day long over the clear plastic playfield protectors. Two reasons:
1) The protector is floating. It can and will move slightly during game play. When dirt is trapped between the protector and the playfield, the dirt particles scratch the PF. Granted, they’re very small scratches, but a few thousand very small scratches starts to look much worse over an insert than a bit of cloudy Mylar.
2) The ball doesn’t react the same with the protector. It almost wanders or “ghosts”. I don’t know how to put it into words but it seems like the ball will begin to spin in a direction totally unprecedented and strange things occur. Maybe I’m the only person that feels this way?