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oh, i always keep vignetting correction, CA correction, and distortion correction turned off.
i'd rather decide after the fact whether they're helpful. most shots end up getting CA correction done in lightroom, but pretty much only cityscapes get distortion correction (i generally find people pictures to be improved by keeping the distortion), and i almost always add vignetting rather than correcting for it.
Only the vignetting correction seems to get written to the raw, so it doesn't really matter with the CA and distortion correction. I only correct my camera distortion about half of the time in the raw converter, but I leave distortion correction on, because I'd rather be surprised with more of the scene, rather than less.
I agree about people pics. Unless their faces are centered in the middle of the frame, the barrel distortion tends to make people look better.