My 40D + 24-70L dropped onto my kitchen table when taking it off my neck. fell about 4-6 inches and the lens just rolled away. The mount stayed on the body. The 4 screws holding the mount on are only screwed into a polycarbonate plastic and they pulled out, the ribbon cable ripped, and that was that. I do understand that it is probably designed as a crumple point, but 4 1mm screws holding in a 2lb lens is scary.
Driving up to the NJ canon service center tomorrow to see how much it will cost me. Anyone ever have to have this repaired before? I doubt my 7 months of remaining warranty will help.