I had the same thought! My Jet Spin is tuned to C-D-F# and I love hearing that tritone. But do different Gottleib games have different bars? Is it possible to swap them out and customize the harmony?

Here's an analogy I like to use:

EM's are like Pac-Man – charming but challenging, lo-fi, small-scale puzzle-based games with short play times. DMD's are more like Call of Duty – often with epic stories, cinematic sound and light shows, a much more complex and bombastic game experience where single games can last 30 minutes or more.

Both are fun, both use the same basic format (flippers and a ball/joystick and a screen) but they offer vastly different gaming experiences. People often have preferences for one or the other, but I think that a collection that includes both EM's and DMD's is a well-rounded one.