Upload & Sell: Off
Well, as a former Canon user, who has moved to Nikon and bought a D800E and D600, first from the UK, second an import, and had an AF problem with the first, and dust/oil problem with the second, I wonder if I'm a statistical miracle! ;-)
Amazingly it didn't put me off and I have changed systems, for a number of reasons - I think the ability of the Nikon sensor to deal with challenging light is one of the biggest pluses for me.
I have a replacement D800E, thanks to the support of Castle Cameras, from whom I bought it - they dealt with Nikon on my behalf when the first came back improved but not perfect.
The imported D600 is from Panamoz and I can only compliment them on their service as well. They have offered me a refund - I have declined, hoping it will improve over time, as I'm given to believe should be the case. Whatever is there is not just dust, because it smears - but the second cleaning was far easier and quicker than the first and only took 3 sensor swabs, so I hope things will keep improving.
My only real disappointment with the D600 is to find it is every bit as prone to hot pixels for long exposures without LENR as the D800/E - if not more so. All the reports I read suggested that would not be the case, but even a 2 minute exposure in the cold brings plenty of hot pixels.
The D800/E has needed no cleaning, despite many lens changes and far more use than the D600 - but at least I've had a lot more practice for when it does!