Frank,
About seven or eight years ago, I traded an FE-2 plus some cash for an FA, and then swapped my MD-12 plus a bit of money for an MD-15, after reading an article by Herb Keppler in Pop Photo about the AMP metering system in the FA, which only became popular after it was re-introduced in the auto-focus 801 body re-named as Matrix metering.
I originally considered buying an FA when they first came out in the mid eighties, but was actually dissuaded by a photo store owner who, like most people at the time didn't really understand what the metering system was or what it was capable of.
It was only after I got tired of the invisable-in-low-light match needle in the FE-2 and Kepplers article that I decided that the FA was the lowest-priced Matrix metering manual focus Nikon body available to me.
I love the camera and use it in Aperture-Priority mode most of the time, and am extremely pleased with the results it gives me.
It is everything the F3 should have been but wasn't, and I'm convinced that if it had been built to the "industrial-strength" standards of the F-series cameras, could easily have been the flagship Nikon Professional body of its day.