started out with F601, got a second used F601, then a used F90, F100, a used F80 and most recently a used F5. dun shoot much with them, mainly shooting digital.
The FM is especially useful for my son who is starting out in photography -- play with the A & S ... and you climb up the 'metering' ladder at a faster rate.
I do occasionally use the F3P when not using the digitals... but still have the F2A, F4s, F5 stored in my camera bags. No longer have my F100 though, just gave it to my dad earlier in autumn this year.