Thanks for the links. My son is the DDR player so I'll share them but he already has thousands of songs. He got 4th at Bearpocalypse Invitational ITG Tournament in Chicago at Mad Matt Garner's this year, and has been hired to work at trade shows like MOMOCON in Atlanta to demo dance pads for Precision DancePads. He can do 20 level songs with S- scores and loves having a 'real' machine to play anytime he wants.
Here's a video of him at a Cosplay convention in Green Bay. He's a lot faster so the songs on DDR machines don't really challenge him anymore.
Correct about the Korean cabinet. I got schematics from several machines and did notice the wire colors differ. Do the US/Japan machines require a 220V transformer, or can the neon ballast run off of 120V?
Overall build quality of the Japanese cabs is better but Damn of the Korean cabs aren't easier to work on