Just received the MD-B16 for my D750 and contrary to lots of reports, this Nikon battery grip is sooo much better than the third party grips (in my opinion.)
Had a third party one on my D90 and it was functional but the Nikon one here is clearly the better product.

Durable; Easy To Use; Improves Product Function; Lightweight

works well

Problem: Can't get one right now . the Nikon MB D-16 is a hard to find item and on backorder everywhere. Warning: The after market brands are reporting battery drainage problems. You just have to put your name on the waiting list, like I did and wait for the real nikon MB D-16 to come in.