Quoted from ecmurrayf1:It also looks like the start button is recessed into the cabinet unlike WOZ.
For the sake of route play I think the bulged out button is better. I've seen many people coin up Stern and B/W games and then spend the next minute trying to figure out how to start a game. They mash the flippers, pull the plunger/push the launch button/pull the gun trigger, and yet still struggle to find that start button.
I think the bulged out start button was smart as far as being easier for non-pinheads to notice.