I bought a good used FM many years ago, and kitted it out with all the Series E lenses, MD-11, Sunpak 611, right-angle finder, bellows, SB-20 ring flash, and whatever else I could find to use. Did all kinds of stuff with it, and it never let me down. The FE I bought though was another story. It failed in the middle of the first roll, and when I took it back, they supposedly fixed it. Well, it didn't last through loading the next roll, so I took it back again. They wouldn't refund my money, saying I must have messed the camera up. I took it to a reputable repair shop, and they said the shutter needed replacement, and was unavailable. Unfortunately, a few years ago, I had to make up my mind what camera outfit I was going to keep when I had to divulge myself of anything I couldn't eat. The N90s outfit won out because it was newest, had the widest array of focal lengths, and I figured had many more years of life in it than the FM.
Earlier this year, I came into ownership of another FM as part of a lens sale. The owner didn't think it worked, but after a thorough going over, I couldn't find anything wrong with it. So I got an MD-12 to keep it company, and shot a tractor show with it. It was great to feel that rig in my hands again. Then last week, a friend of mine sent me a box of stuff with a note that said "some work, some don't". In amongst all the stuff was another MD-12, and an FE. WooHoo! The MD-12 only works on continuous, and the FE will lock-up the mirror if you press the shutter release too far without turning on the meter circuit. You then have to turn the shutter speed to M90 to get the mirror to return. Both problems are fixable, so I'm more than happy to have them. The more Nikons, the merrier!
PF