Quoted from DaveH:They are a giant logic circuit built out of leaf switches! All they are doing is moving electrical power around that circuit to the right spots, and they are amazing. When something goes wrong, you are can actually trace out what is happening in the circuit. I may be slow at fixing them, but it is a lot of fun. And playing them is a wonderful experience. Just last night I was overjoyed at knocking free games on my 4 Square. Yes, all of the games are free, but having a good enough game to knock a special is a blast.
I was born in '83. Playing a machine with rebuilt pops and flippers really(!) makes a difference.
Working on an EM is exactly what DaveH says above, tracing the flow of current is fun and easy to do compared with a solid state. "So it goes from the switch to the board and then something happens and the transistor is grounded and the coil fires" changes to: "So it goes from the switch to the coil and it fires."
EMs are MUCH simpler to work on. And I have worked on all eras of game - not every manufacturer, but quite a few. I don't like the black box nature of solid state games (for repair).
As to the games being slow? The fastest game in my collection is the 1963 Chicago Coin Twinky. 2" flippers. I have solid state and a DMD. The problem I have with modern games is the stop and go nature. Of course, I grew up in arcades playing the modern games of the day, and I like those, too, but EMs are all about hitting one of several goals.
And once you understand how to fix them? You can certainly add 'mods' to add new goals, features or abilities. I don't approve of that, typically, but there are folks who do it. It's all about adding steppers or switches to do what you want. It makes more sense when you have fixed a few.
One of the folks I interviewed talked a bit about how you can think of EMs as DC if it helps to visualize the repair. I think this trick is handy for folks who are just getting into EM repair.