I have 3 F100s and shoot on Tmax100, 400, Plus-X, and Tri-X. My camera is set to Aperture priority and usually Matrix metering, but when needed, I switch to Center weighted. My exposure is usually good, or as good as any automated metering would be. I have not noticed any under-exposure tendencies.

If there is a deep shadow in the scene and is a high contrast situation, it does under-expose the shadow but I don't expect the camera's metering to be able to recognize this kind of situations and adjust accordingly. In these cases, I typically use exposure compensation and over-expose by one stop by hand.