I purchased a Nexus 4 phone from grndzero  and the communication was top-notch.  You can see the original for-sale posting here and the log of the transaction was here on the newbie forum because I was not yet able to post in the main forums at the time.

This was a fantastic example of how to process a sale with public communication and I will be following this model myself if I ever sell anything, although I can't think of what I have that anyone would want (unless you're interested in 10 broken Xbox 360's in various states of functionality .

Thanks again!

A.C.
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