Upload & Sell: Off
Other than the OP's issues, I don't think many others are having problems. In my book, Canon DID nail it from the get-go. I have not had a single complaint, and I love them so much that we bought a few more recently.
Let me clarify... We are still using the 600's and have been problem free for quite some time. I think that we've sorted out all of the potential issues.