About a year and a half ago, I was shooting at a wedding reception with a 5D and I heard this "chi-chunk" sound and half my viewfinder went black. (I wrote about it, I think - kindof a shitty thing to happen)
I pulled the lens off and the mirror fell out on the floor.
I sent the body off to Canon and it came back about a week later, totally fixed and CLA'd (clean, lube, adjust) - no charge whatsoever - they even covered the shipping both ways. I thought Canon loved me, and I was a fanboy for life.
Fast forward to a couple days ago, and I see a bunch of articles pop up about how the glue holding the mirror onto the 5D is defective and Canon