Just a quick warning: I removed my fake D600 battery grip to take a picture for the GGS post and when I put the grip back, none of the grip controls work any more (dials, directional pad). The camera continues to get power from the grip but otherwise doesn't work. I don't know if it's permanently broken or what. But just wanted to get the word out there right away.
UPDATE 1/6/13: tried the fake D600 grip again and it works again just like it did before.