I purchased a Meike one for my D750, tried it on and boxed it back up and retuned it within about 15 minutes! To me it felt too plasticky, and a bit 'creaky' in the hand. I also didn't trust the strength of it, especially as I like to use a BlackRapid strap.
I have since paid the extortionate £220 ish for the genuine Nikon version, which initially doesn't seem worlds apart from the 3rd party grip - but it does feel better in terms of build quality, and the finish of the plastic and rubber grip matches the D750 exactly.
If you can afford it, go genuine - it will be a better product.