All tested for function and they work fine, if any issue is observed, it is mentioned here to the best of my knowledge:
Almost all need cable exchange I believe. Its firewire 800 cable which is inexpensive, on top of that:
Scanner 1 and 2: Color scanner, no other issues
Scanner 3 and 4: Black and white scanner, no other issues
Scanner 5: Color scanner, fan needs change to stop heating
Scanner 6: Color scanner, button is hard to press, needs exchange
Software and tips are not included.