I've got a 14x17 which I need to use more. The reason I have it is that it was available at the time I was looking to get into ULF (beyond 5x12). It does not travel well, and although the camera itself is reasonably lightweight (for the size), adding in five film holders and boom! I'm hauling 40+ lbs around. There's also a story behind the camera - I know personally everyone who has owned the camera, including the maker of the camera. It is 99% likely that when it leaves my hands, that chain of ownership will break. It's still a monster, but it's less of a monster than a 16x20, and the film is cheaper too. If I wanted to shoot x-ray film, it's available at that size as well.