Didier
"Deed"
Buying a used R-D1(s) now is only smart if you have the opportunity to check it closely before buying. Mainly RF adjustment (vertical, horizontal), frameline accuracy (vertical, horizontal, tilt), focus accuracy (wide open close, mid, infinity), sensor (cleanness, position [my first one was tilted]). If you can buy it from a trustable seller that can clearly confirm that all mentioned points are correct, it's ok, too. Otherwise it's quite risky, I'd say (and less than smart).
Didier
Didier