Reviewed here is the Nikon EN-EL15 Li-Ion battery.
Well, the quality of the batteries you can only say that it is precisely the quality Original Battery EN-EL15 Nikon. This is the same battery that was supplied even with my D7000.
About the price can be discussed. However, I think that you look at a camera (depending on camera model more precisely) must also be aware tasted well over 700 that a faulty battery of foreign manufacturers can damage the camera. So you stingy in the wrong place, the camera is back in the worst case and has no claim to warranty or replacement. As I said, my opinion.
The quality and performance of the battery are great in my eyes. The battery lasts a few years, the investment has been worth it, right?