There’s a compatibility issue with Sigma lenses, which Sigma has offered to correct free of charge, whilst throwing in a general lens service at the same time.
AFAIK, Canon EF lenses are ok.
Regarding the issue of “early adopters” being used as guinea pigs for final testing of new technologies, I have to agree that it sucks, but it seems to be here to stay unfortunately.
I bought a DVD recorder a year or so ago, when they first came out. The problems with it were unbelievable, but by keeping a cool head and complaining “properly”, I struck up a good relationship with the manufacturer and have successfully received replacement models, keeping my unit up to date so far.:)
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