
The reason I went with the grip is that I use LV alot and the it kills one battery pretty quickly. A downside? Not really if you have back up batteries.

LoL yes, I'm not a grip fan/user, but oh man, the D800 battery life is just awful when using live view. I dunno what it is, but it sucks down the juice like a..uhh...i dunno, was trying to make some athlete and steroid reference, but i'm too tired. /cry