Just thought i'd share my recent experience with a D600 and Harvey Norman.
I originally purchased a new Nikon D600 from Harvey Norman about 4 months ago.
After the first day of use I noticed some small spots during processing, straight away I thought hmm ok maybe someone had got this out when it was in the showcase and had got dust on it.
So I proceeded for another week and more and more spots started to appear, ok i'm thinking I might have a D600 with the oil sensor issue.
Took the camera in for a sensor clean and inspection, verdict came back yerp I've got a dud
Soooooooo, I thought ok i'm going to be smart about this and just overload the Harvey Norman sales rep with info when I go in to talk about the oil sensor issue.
So with a small book in hand consisting of print outs from the net on the sensor issue on D600's and photos on a laptop showing the spots getting worse and worse I went in with the intentions of getting a new replacement D600 not just a fix.
Anyway long story short, I didn't even have to get the laptop images out, this guy got about 1/3 through my mountain of paper work and put the white flag up :P so i'm thinking ok now it's time to bring out the ace card.
Then I presented him with more paper work on the Nikon D610 and why it's basically the same camera but with the sensor issue fixed and that technically the D600 will be replaced by this to solve the problem and that I should be first on the list to receive one because i'm such a good customer and all :P
End result was a brand new D610 and they allowed me to continue to use the D600 the whole time I was waiting on the new one, thanks Harvey
One happy camper now I won't be spending half my life getting rid of sensor spots :P I was starting to dream about em :P
Thought i'd share this story and good luck to anyone else who tries