Most non-pinheads that come over to play have spent the most time with the system 11s and Gottlieb system 1s that I've owned. Easy to understand.
Overall, Dr Dude, IJ, and Sinbad have been the most popular with the wife and family. They love playing a game or two on everything I've brought in, but they always keep pressing the start button on those three.
My stepdaughter wants a WOZ; my wife can't stand it.