That is nice! I've got a Pi + a Pi2JAMMA adapter, which hence can be swapped instead of the PCBs in the vintage arcade cab I've got at home. I've got a few PCBs (not many) but the Pi allows to have way more games.
And some PCBs are notoriously hard to run on the real hardware (and many are not even JAMMA, so it's a PITA to do the wiring): like Robotron 2084 (amazing game, with amazing controls: no buttons, it's played with two joysticks, one to fire in any of eight directions and the other to move in any of eight directions).
So the Pi is very convenient to run all these fancies and "unobtainium" PCBs.
Seriously: playing old games at 60 Hz on a CRT is quite something.
The Pi2JAMMA adapter is bigger than the Pi (the Pi can be seen "sitting", well really plugged into, on top of the adapter), which is quite funny: