Anything can fail and that includes old Chevy's or I'd need a new job. Blaming Canon service isn't too wise since after they did whatever they had to do it was shipped back using several vehicle / depot changes where it could have been dropped, hit by another box, or taken several tumbles etc, and any one of them could be the real cause for what appears to be a poor repair. I've only had 2 things serviced by Canon Canada & both were done promptly & correctly.
Your arguement is lacking one serious detail. The new $2500 5D MkII should never have left the factory the first time, in need of a mirror repair. Again, BAD Canon, BAD dog...

