Hey Guy's, For what it's worth, I used to regularly swap backs on my Nikon F4 from standard, to multi-function control back, for intervalometer use. Keeping it in place was awkward to use hand-held. Anyway, I had to replace both backs after a couple of years due to excessive wear, so since Leica hasn't even really had the backs out for long-term field tests, I don't see how thay could say that there will be no problems with back wear. I mean Nikon's F4's are built like M48 Patton tanks, (I'm showing my age), and are pretty much bulletproof and if they can experience wear............. Art Tafil