David Murphy -
No need to apologize for going against the grain but I disagree to an extent. You'll - I dunno, pay $30 for a GSN shipped. And yes - you may get a great sample, or not. Luck of the draw. Sooooo.... either buy one CLA'd in advance like I did with my GSN for $40. (There was a seller doing this regularly on eBay, don't know if he is now...) and you'll get a "functions as good as new" GSN. Or PM Gman here and see if he's fixin' to put any in the classifieds.
Orrrrrrrrrrrrr.... spring for $80 and have it CLA'd by Mark Hamma. Max you'll spend is $100 for a fully functional, works like new sample. Still very cheap, imo, especially relative to the cost of any used Leica. By the way, even though the "lowly" GSNs suffer from "mass produced consumer grade mechanics and all the issues that go along with it", do you really think a Leica of the same vintage unserviced, with their "hand-crafted mechanical swiss watch percision" construction will not suffer any "consumer grade/mass-produced" old camera issues and function flawlessly w/o a trip to the technician??? I might argue, anecdotally, that you might have a better chance of getting a fully functional GSN if the POD doesn't go from 1971 than an unserviced Leica from 1971.
I say a 40 year old camera either hand-crafted or mass-produced will suffer comparable issues if they haven't been serviced since purchase. And the battery issue you allude to have simple fixes, especially with the GSN that can handle 1.5v variances without effecting the meter. Put a $0.20 spring from the hardware store in the compartment, and something to "fatten" the battery - paper, cardboard, whatever, and you're in business.
Or, you can get a hand-crafted, solidly constructed, definitely not mass-produced battery adapter from Yashica Guy for $12.
As far as the lens quality goes, dunno, I've seen some stunners from what you describe as a "fairly good" 1.7/50 DX Yashinon but I know it's no match for that banged up $300 1936 uncoated 3.5/50 collapsable Leica Elmar - but you know, all those Leica lenses have that "special certain something" that those cheap mass-produced lenses never could match. At least that's according to the Leicaphiles and the Leica marketing folks.