I shoot a lot of vertical/portrait orientation shots... so I nearly always use a grip.
This and the problems with DPP and 5DIII files make me wonder... I can't remember Canon ever releasing a camera without the major components for it being available very close to the same time. And I can't recall them putting a camera onto the market without DPP being pretty well ironed out, particularly for things such as image sharpness.
I wonder if they rushed out the 5DIII for some reason, perhaps in response to the D800.
I always wondered, too, why Canon doesn't use a more obvious naming convention with their grips... Such as calling this one a "BG-E5III" instead of "BG-E11".
The Canon marketing dept. also has done a pretty crappy job with the BG-E11... They provide the photo illustrations to the retailers and most only show front views of the grip. Amazon, B&H, Adorama... they all only show front views. Meanwhile what is probably the most significant change with the new grip is on the back! (dpreview.com has a back view of it) One would think the Canon marketing dept. would be all over that, getting photos of it from all angles out to their retailers. Heck, the secondary joystick on the BG-E11 might be one of my key reasons for upgrading from 5DII (after the dust settles)!