I bought an FM3a, and it is a wonderful camera. Some people think that they are overpriced, but when you compare the camera and what it can do to the likes of say a M7 o MP, it is a bargain. I bought mine mainly or shooting my Nikon lenses in situations where I didn't want to waste time on guesswork, just focus and shoot. The A mode is wonderful for this purpose. I have been let down by dead batteries in my old FE, so the manual shutter mechanism is a plus to me. Also, the AE lock is a very important feature, and it allows me to meter on different areas of my subject.
But, despite all the bells and whistles, I still find that I spend more time shooting with my old F.