Is the ME Super suffering from the non-cocking shutter fault? As in you wind on, press the button, and nothing?
From what I understand this is due to a single component rather than the shutter proper and should be sorted by a CLA. The shutter mechanisms in these are pretty reliable if used regularly, however I do notice that a fair number of "wardrobe find" SLRs with this shutter suffer from the fault. I'd imagine that it's a part which has seized over time and therefore doesn't drop into the correct place.