I have a bally mishmash of a machine based on the Sir Prize model, with hold buttons and a change facility built into the top. Only issue now is it doesn't pay out on the 50p jackpot, or rather it pays out random amounts a lot less than 50p.
My other machine is a newer (1998) Barcrest Arabian Nights, which works perfectly. My only gripe is that the reels stop too quickly for a home machine. This is fine if you want to make as much money as possible but not so much fun when playing for pleasure. Can the MPU5 be reprogrammed/set to increase the reel spin time?