I have a Meike version that I've been using for a while. It doesn't feel quite as nice as the Nikon version, but it works okay in practice.
One thing I did notice recently is my AFL button on the grip won't work for back button focusing. I've not really looking in to the issue greater, it may just be another setting, but it's of note.
Edit to the above, I just found the setting to enable AF-ON via the battery grip. Again, not as nice to press as the one on the camera body. Not sure how it compares to the Nikon.