Thanks for posting these articles. I think there is a lot of need for "myth buster" articles like that. It's always good to have somebody put things in perspective who has access to larger data sets than the average bear. Often enough the discussion goes something like: "My XYZ doesn't work. Canon/Nikon sucks." - "No! My XYZ has been working flawlessly since 19XX and I am a wedding photographer!!"
We've all seen it. And both could be right - somewhat.
What I really would like to know from Roger by the way is the actual failure rates (and I don't mean the camera-dropped-in-the-ocean kind of failures) he sees. For lenses he gave the estimate that 3-7% of lenses are somehow off or considered "bad copies". How about bodies? I don't mean just focusing issues but other problems that have been discussed over and over. Or I'd be very interested to hear what the actual failure rate on the 580EX II (or other speedlights) is aside from random anecdotal reports we've seen.