I can't speak for Doug but my experience with the Metabones has been great. No issues, no lost capabilities. I've even used my 500mm lens hooked up to it. Come to think of it I think I was manually focusing then but I don't recall why.
I think it is the cheaper adapters that may snip some functions. Honestly with a 1 y/o I have not been out as much but I am off to Denali NP next week so hopefully I will get some shoting in up there.
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