How common are failures with m4/3 lenses? I've principally used manual Nikkors for the last 25 years and obviously there's not a lot to go wrong with them. I've never had a problem with th handful of AF-Ds I've owned, but obviously the m4/3 beasts have a bit more to them in terms of bits to go wrong. I'm thinking of picking up a 25mm Pana-Leica, and obviously the saving on used/greymarket is substantial compared to UK list. I've not worried going used on sub-£200 lenses but this will be more of an investment.