Over the years I've gradually collected an FM (the older type with the knurled ring around the shutter release that you turn when you have the winder attached), an FM3a and a black FM2n. I have to say that I tend to gravitate towards the FM2n, not for any real reason other then everything on it feels right. I prefer match-needle metering of the FM3a just so you can see how far over and under exposed you are, but it doesn't make that much difference. I tend to use HP5 in the FM2n, provia in the FM3a, and keep the FM for more exotic films that get less use, like infra-red. I think the FM is remarkable in that the one I have must be 25-30 years old now, and was used in an industrial setting that meant it had one to two films through it per day for over 10 years, and was only serviced once, and still works perfectly. I admire that knid of engineering.