I would think that they are obliged to replace with one in at least as good condition and with a similar shutter count to yours, if it is a refurb it should have been thoroughly inspected and tested. If it was me I would go with the refurb, if shutter count really worries you try to add the proviso they find one within a couple of thousand clicks of yours.
Also, is the refurb done by them or Canon Japan? If by Canon Japan, based on the German centres record with your camera you would probably be better off!
Possibly you would be better off even if the refurb was done in the German centre as it probably won't have had as much interference as yours would after repair.
Also it seems they are making it pretty clear that is the way you are going without a big fight, and their offer would probably be considered more than reasonable (apparently the most expensive word in law ) by a court or impartial adjudicator.
I agree it is a tough call if you treasure your equipment as I do, but the non sentimental reasoning is easy from the outside!
I got an phone call some minutes ago. After writing an letter to Canon, a service employee called me.
The would exchange the 6D, as it is not worth repairing it. I will get an refurbished one. But he can not say, how old and how "used" the 6D is.
What is your opinion? Should i take the refurbished, or rely on getting mine repaired?
The time of warranty for my 6D expires in June, the warranty of the refurbished one in June too.
Concur it needs to be comparable "wear & tear" to yours, incl. shutter count. You should also add the proviso that if you find any fault within a fortnight, then they need to repair the original so you have the opportunity to thoroughly test it.
I thought, but have not checked, that Canon UK refurbs on Ebay have a years' warranty. I appreciate they are matching their refurb to yours, but I would check to see what Canon in your country do and perhaps politely ask (if there is a difference) why they are not providing the same.
You can also check if there are any refurbs being offered - as in, are you given any choice on which 6D or are they chosing? If it is a refurb, ask them is it being listed somewhere for sale (if not, again politely, why not?)
Did you have any calibration done with lenses? I have my bigger lenses done by Canon, so you would expect them to provide a calibration for the new body.
If you go this route, thoroughly check everything - use a sensor loupe to check for tiny scratches, make sure you drive the shutter mechanism as fast as it can go to ensure it works under "stress", check all connections & slot (insert, remove, repeat), test all camera modes / functions, even if you dont normally use them and of course do some real world tests with all your lenses ideally in different conditions (cold, warm, daylight, dark). To do this properly will take a few hours of your time, but it will give you some comfort.
Finally, ask them for their own test sheet to show what they've tested, and where possible repeat their tests as well.
Good luck and sorry for your woes...