Not being much of a multi guy isn't the Blue Elf illegal to run in an arcade? I recently saw one in the wild and what got me was that the Marquee said "Blue Elf"
Yes... it is. The ONLY "multi" legal for on-location use is the Global VR stuff (Ultracade, etc.)... there are also a couple of brand specific multis that are legal (Namco's Reunion board for example).