I could really benefit from a "faster" camera when trying to get an unblurred shot of everyone who passes me. I do mean faster operating , not Frames per second.
With less sales and Events during this recession and those averaging less $ each, I just cannot afford the D4. Also the weight (typically with a 70-200 lens, but even with a 28-300) is just too much for me, at 68 years for even two hours let alone 8-10.
Back to the D600. I have never used an add-on grip that I like. Is the Nikon one that much easier to hold than the camera without the grip? I personally feel the advantages of this grip are limited to that possibility, and is probably out weighed by the extra bulk and weight?