I've purchased three refurbished cameras... two from Cameta, and one from Adorama. In both cases, the cameras arrived in like new condition, and provided me with zero problems and absolute reliable service.
I would also have no hesitation to recommend or purchase a Nikon refurbished camera. The only caveat is to actually make sure it's been refurbished by Nikon and not just being called refurbished.
Refurbished cameras purchased through Cameta or Adorama have been fully checked by Nikon. Doesn't mean there couldn't be a problem (over the years I've read about a couple) but they stand behind it and will replace it.