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I actually called and got thru to the correct tech dept at Nikon USA to pose this question about the 600 and 7000. He said it was a thing of the past, but when i pressed he never acknowledged the issues were anything more than dust, and that the reported incidents were at such a small rate that there was never a consideration to do a recall. So take this reply with a grain of salt. I did just buy a new D7000 and ran a bunch of pics thru and there is no dirty sensor or back/front focus issue whatsoever. I tend to think, and I could be wrong, that even though there's seemingly allot of cameras with these issues on the web, the perspective I have is that it is still very small. How many people buy one and spread all over the web that their camera, car, lawnmower, whatever works just fine, the bad reports propogate out more widespread. Case in point, I have a 2010 Chevy Silverado. The internet complaints spread like wildfire about what huge oil consumption my model has with the 5.3 with cylinder deactivation feature. Mine is just fine and millions of these were made. Good luck, sometimes ya just gotta' roll the dice I guess. On the flip side, nikon recalled a huge batch of batteries with only having seven reports worldwide, but the fact that they could melt and cause a fire was the difference rather than the worst case a lousy picture. Who knows...