Isn`t the Nikon?
You sure?
Nikon.com
We have manufactured the battery pack out of a magnesium alloy. The old MB-D200 was made of engineering plastic.
Mine is.....
I have tried a 3rd party grip and also own a Nikon MB-D10.
I wouldn't bother with the third party, whilst there are some good ones out there they mostly feel cheap. A good 3rd party isn't that much cheaper than a second hand Nikon item. The way I see it is that not much will go wrong with the grip so second hand is the best option. The battery grip makes the camera so much nicer to use.