I've been beating on a Hexar RF for over a decade. Don't believe all the junk out there. Leica snobs hate the Hexar because it is a better picture making machine than the Leicas. To say that Leicas are better is just folly. The Hexar has Titanium covers. Try to dent it. It will suffer knocks better than a Leica with it's brass or zinc covers that look like holy hell after a few years of use and knocks. The top shutter speed of the Hexar is faster, flash sync is faster, meter display is better, motor wind, aperture priority automatic, exposure lock, won't burn a hole through the shutter... Lots to like about it. The only thing that I don't like about it is the slight shutter lag it has since you are dealing with an electronic system. It is true that if it goes south on you it might not be fixable, but worrying about things that haven't happened and might never happen isn't very smart. When I was contemplating getting mine, I weighed those concerns and decided to get one anyway, and like I said, I've been beating on it for over a decade now. The paint is worn off all the corners and it is still kickin'! Even if it breaks and is unrepairable at this point it has more than paid for itself.
I'd get the Hexar, and I'd also keep the M2.