I have bought some FD lenses to test with M.
This is one of my first shots with a newFD 200mm F4.0 lens:
FD 200mm Love Locks by VeijoM, on Flickr
Here is one with newFD 50mm 3.5 macro:
IMAGE LINK: http://www.flickr.com …35883172@N02/12724703594/
FD 50mm 3.5 Macro test "Flowermouth" by VeijoM, on Flickr
Bought also newFD 50mm 1.8 lens and (old) FD300mm S.C. 5.6 lens. Although I could live with the 50mm 1.8 lens and could use also the 200mm lens, I have decided to keep the 50mm F3.5 macro and sell others.
My thinking for the future of "my" M system is to have it as a small macro camera and buy something bigger with a viewfinder as a body for tele lenses. I bought an LCD viewfinder for the M, which I used with the 200mm lens, and quite soon realized that I could be more happy with a dslr, like 70D, for tele shooting. But then again, that is quite obvious.
Hopefully Canon is not going to announce a version of M with a good EFV right after I decide to buy the 70D.