"Nikon Inc. is asking your cooperation in connection with a voluntary recall of certain lot numbers of its Nikon Model EN-EL3 rechargeable lithium ion battery packs. The battery pack can experience a short circuit causing it to overheat and possibly melt, posing a potential hazard to consumers. There have only been four confirmed reports of incidents of the problem worldwide, and while no injuries have taken place, ..."
This is not to say that all 3rd party batteries will fail in such a manner but if they do how will the manufacturer or retailer stand behind their product. Look over Nikon's recalls involving batteries and you will see a couple. The recall for the EN-EL3, original, was well after warranty expired for many, yet Nikon replaced the older out or warranty batteries for free and even supplied free shipping labels. Nikon does use proprietary circuity within its batteries. 3rd party batteries may or may not have a compatible circuity. Incompatible circuity in the battery will not allow to fully function in Nikon camera.
From the experiences of many here, 3rd party batteries do not provide as many shoots as Nikon battery does and might not last as long as a Nikon battery.
In the end the choice is yours. In a pinch, sure I would use a Duracell replacement, but I have a spare Nikon battery. When you look at the cost of the rechargeable batter over the life of the battery, the cost difference becomes very small.