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Doug - not boring at all. In fact, very informative. There is a slight difference, but definitely for the better. And something to keep in mind. For me though, it would be extremely difficult to give up EXIF focal length info. I change lenses quite frequently and would likely forget which shots were with which lens. Would have been nice if Leica allowed the camera to read the coding for EXIF but disable corrections. But this seems to be the best solution for the ISO-less method.
Glad it was useful. I'm noticing that, even though the M9 does adjust vignetting correction as the ISO goes up, it isn't a dramatic difference, and it still causes weird edge issues, even when raising camera ISO, so I think it's useful whether you shoot "ISO-less" or not.
I do have a handy trick to identify each lens without EXIF. I assign each of my lenses with a number, and, immediately after changing a lens, I take a quick throwaway shot of the lens' number using my fingers. So, when viewing my pics in LR, I know when each lens change happens. In other words, when I shot more lenses, my 28/2.8 was a "one," 35/2 was a "two," 50/2 was "three," etc.