So far, we've had three failures, not by regular members, but those who came to the group asking for info.
I've been reading/lurking this forum for a while. When I saw others were having the same problem I had with the 24-70II, I figured it was time to register and post my story. I do feel this is a very limited problem, but people should know about just in case.
So, an update. The lens shipped out today. Canon service assured me it would be taken care of because the lens was still under warranty (for another week). So, it looks like everything will be OK, and I'm not out much except shipping charges and loss of the lens for a week or two. Kudos to Canon service on that front. I wasn't as happy when they said in order to replace the 10 cent part which fell off the top of my 5d3 (ie the piece that says AV, TV, M, etc) I would have to send my camera in and the whole dial assembly would have to be replaced at fair cost. Yikes. Fortunately, I scoured my car and kayak and luckily found it and will re-glue it myself.
All in all, I've been generally pleased with Canon service, though there have been a few issues along the way.