As of today, this machine is still here, $0.75 for 3 songs. Fairly low volume. Screen is stretched out at the top but readable. Pads mediocre -  weak up arrow on both sides, and brackets are rattling. Was able to FC and SDG So Deep with a little stomping.

Like ckjy said the pads are playable, but expect regular pad errors. The P2 side is slightly better, and the screen is indeed stretched, so half of Left P1 arrow and half of the Right P2 arrows are cut off.

None of the hidden songs appear to be unlocked.