The structure of the X100 subgroups doesn't seem to provide a good sub-forum for this discussion, but here it goes.
I've only been out with the X100 for one day. It was a fairly sunny day at the rodeo. I noticed that the matrix exposure mode had a real tendency to blow highlights when shooting a contrasty scene. When I'm shooting people, I think that I'll resort to shooting in spot metering mode off skin tones and using the exposure compensation. I've yet to try external metering to see how the expected and the manifest exposure differs. I've unlocked AF/AE and use the button for locking exposure and partial push of the shutter for AF. I think that I'll pickup the EF-20 for fill flash...should it ever be released to the retailers. I found that my little Metz 20 C-2 doesn't work well with the camera set to Auto-ISO.
How about your X100 metering tips?