Hi Grant
I have a Baywatch which has the extra large screen, so understand your concerns.
If the guy says that the screen randomly drops out and game resets it is a power supply issue to the dmd as they like a neat 5volt. I just went through this but now mine is working sweet.
I have heard on either the bottom right or bottom left of the dmd is if the screen is lighter in colour that it means it is starting to out gas so avoid. I am not 100% on this just repeating what warnings I have heard about large screens.
The sega's are made well, and play well.
PM pop bumper pete as he has one of this, I think?, but like Nino says definitely try and inspect and play.
