I have the Nikon MB-D10 and a Vello sold by B&H. They both work on either my D700 or D300s. The Vello is lighter and the control wheels aren't dampened like the Nikon but other than that it functions the same and the cost of the Vello is $52.95. I use it with a EN-EL3e battery, I don't need the 8fps of the EN-EL4a since I'm using it with the D300s. I'll also mention that the Vello is identical to the Nikon as far as appearance goes.