I have NEVER been able to incapacitate any of my F series Nikons. With the exception of an F2 body, which I will soon attempt to refoam, my only expenditure on these beasts has been for CLAs. Some are dented, several are brassed, but none have ever failed me. These cameras have been used (without any modification) in temperatures ranging from +45C to - 40C without problem. Further, I have yet to regear any of the MD2 drives. I cannot imagine using anything else.