Absolutely agree. Some DS M3s' are starting to show their age with the rangefinder/viewfinder being rather dim. If you can, check before you buy.
Jim B.
I offer these comments on "dim" rf/vf's on Leica M3's -
I have several DS M3's. Two of these had quite dim rangefinder patches when I bought them - DAG serviced both of these cameras for me and brought the "brightness" or contrast of the rangefinder patch back to a perfectly useable level of performance. My oldest M3, among the first year production of that model, had no visible rangefinder patch when it arrived here. Despite my aging (age 61+) eyes, I can now focus this jewel at a light level which would require 1/10th sec, f2 with ASA400 film - you'll have to work out the footcandles or lumens for yourself here, I'm afraid, but it is a pretty low level of light to be shooting photographs handheld, at least)
DAG will delve into the M3 rangefinder optics far more deeply than the other (perfectly competent) service shops. My message here is that a dim rangefinder in may not a fatal flaw but an indication that specialist service is needed. I wouldn't buy a camera with a dim rangefinder patch, but neither would I discard a camera which I already owned for that reason.
To answer the question about the price of the camera, it seems quite attractive, provided the seller offers you a reasonable amount of time - say a week - to go out and shoot a few rolls. If you don't have a darkroom yourself, buy a couple of rolls of color negative film and have them processed at your local one-hour photo place.
If all is well, buy the camera. However, start putting funds aside for a CLA ; all mechanical cameras need them regularly (electronic/plastic bodied cameras go to the landfill).
Good light -
Graybeard