as the shutter of my 1ds disintegrated and it's with canon for a bit now i am using my 5d for all my work. it is a great camera, indeed! i was considering the vertical grip, but as i hated the 20d one i stayed away from it for now. today i stumbled upon this:
http://www.time.com/time/yip/2005/index.html
do you see that all images are in landscape? coincidence? or are the photographers aiming for double pages? or do they all wait for their vertical grip?
when i was still shooting with rangefinders, 95% of my images were in landscape orientation, with the 1ds with the great vertical holding i shot much more in portrait orientation.
stefan