What he said
Originally Posted by Travis Nunn
It was a significant reason for me.
Honestly for me the primary reason i choose the RB67 is how completely modular the entire system is from camera body/lenses, viewfinders, focus screens - the whole kit is awesome - truly professional. The "Rotating Back" was huely influential. The ability to use the largest roll films reasonably available was icing on the cake.
If you're looking to maximize the film real estate available to you, using roll film, why settle for a smaller format? The RB is hefty, but with a strap/handle it's a very manageable package and well worth the little extra effort to use. On a tri-pod it's superb - it really is without peer.