If it is a Nikon refurbished unit you shouldn't have much concern as they do a thorough job and offer a 90 day warranty. The refurbished bodies may have been sent in for very minor problems such as focus issues or maybe had been a demo unit. They all are tested before released. If not much difference in cost you could go with new and have a longer warranty but if a big difference I believe you'd be well served with the refurbished unit. Good luck.
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