
to all of the above! I have spoken to them at least 3 times, and they were very helpful, polite, quick, knowledgeable, non-accusatory, articulate, and even friendly.
I also love that when you request to speak to them on the phone, you can choose the time to be contacted. It came in very handy when I was checking on an exchange and needed a few extra minutes to find my first Kindle's serial number.