I have the successor version in the M-II and it is one of my absolute favorite cameras. The LV system works better in this camera than any other model I have seen, and the images I get back from it are always quite pleasing.
If you need to, the RF patch can be horizontally adjusted by removing the cap screw on the back of the RF and inserting/rotating a precision screwdriver to adjust.
The M is the upgraded version of the Minister camera, itself a fine camera. The M's upgrade is the f/1.9 lens. When the successors were rolled out, the M-II's improvement was a 1000 top shutter speed over the 500 on the Minister.
All in all, an excellent camera with lots of potential, and a very overlooked model.