Upload & Sell: Off
As I stated in my original post, I never intended on buying the D600 just to return it. I purchased it, and began to question it's performance. I thought it must have just been in my head, as I have never had AF issues like this with any other bodies.
I live on an island in the middle of the pacific. We have no camera stores, we have no rental shops. Anything purchased must be shipped in, generally at an increased fee.
I recently went to the mainland, and found a D800 at the same retailer I ordered the D600 from online. I elected to try it out, to see if it was just in my head.
Once I began to shoot the D800, it became clear the D600 was not going to work for me.
Retailer sells a D800, takes back a D600. They generally return to manufacturer, but if it is resold from them, it will be labeled as used. Camera is in great condition.
Bottom line, this was not an "extended free trial" on my part.
I hope my analysis of the differences will aid others in their decision. I also have enjoyed my fellow FMers input on their experiences.