I was hanging around in a dealer waiting for some prints this afternoon, so I fondled a DS M3 that has been on his shelf for ages.
My conclusion: it's a good job there is absolutely no way I could afford it 😱
The double stroke on the wind felt really good to me, and immediately different enough that I could predict no trouble at all switching between it and my M2. The whole camera felt great, actually. Silky smooth, and a finder to die for. Now I understand.
Not cheap, though. GBP650 with NRC and Elmar 50/3.5, or GBP550 without the lens. Serial number 88xxxx. In what I would call pretty good user condition, but no collector would touch it I reckon. (Line of brightmarks on top plate, from the meter? Few-millimetre chip to the vulcanite bottom left corner of the camera. Lots of gunge around the windows, patch ever-so-slightly dim. Shutter sounded great, though.)
But to the OP: had I the money, I doubt I would hesitate.