Not having backup batteries for your camera is an amateur mistake. Imagine driving long commute to a friend's wedding, and find your camera won't even turn on after coming to the place. You don't want to miss a perfect shot because your battery is died out, or sitting on the charger. It's a good opportunity to have 2 extra packs and USB powered charger. It makes it easier for international travel, as it's one less thing you need a plug the adapter.
The batteries are of slightly higher mAh rating than the original (2100 mAh Vs 1900 mAh) but look and feel exactly like the Nikon factory batteries. They are also interchangeable with a number of Nikon cameras which is another reason to have it.
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