I used an FA for a number of years but eventually it developed an annoying fault: occasionally a frame would come out completely blank for no apparent reason. Maybe the shutter developed a fault but because it was completely random I never managed to get to the bottom of it -- yes, I did try changing the batteries ;-)
About ten years ago I replaced the FA with an FM2, which is still going strong, and even bought another FM2 quite recently. I am totally satisfied with the FM2. Even though the metering is relatively simple compared to the FA, there is a lot to be said for simple, manual metering. And the LEDs are visible under even the darkest conditions.