I've used on the 5D2 the battery grip and was with him in every way satisfactory. Therefore, for me there was no alternative to the Canon battery grip for the 5D3. Since I photograph a lot of portraits, the battery grip for me is an essential tool, as all the important controls are also accessible in portrait orientation on the battery grip. While it goes without, only after a long session, the fingers knotted. To my mind, Canon has it with the new battery grip, as done with the 5D3, to improve the existing essential, without that one can speak of a device truly "new". For me, this evolution is actually better than a revolutionary new device on which all controls are suddenly somewhere else. Canon has additional features of the camera copying to the battery grip so that reaching round is required even rarer. The handling of the camera with battery grip improved (one has the apparatus firmer to the touch) designed, but to my mind it is rather for something smaller hands than mine. But it is. People with real "paws" but could get in trouble. Loading two standard batteries (LP-E6) doubles the runtime, which is also very convenient. Battery performance on a 5D3 already is very good, with the BG-E11 seemingly endless. Although you can also use regular "AA" batteries using the supplied battery adapter. However, this is much Popelei to insert the batteries ... The locking of the battery compartment is now similar to the battery handles of the smaller models (fold up lever and rotate). The ingenious storage for the standard battery has remained.
