I own a Cambo 6x12. Had it for at least 8 years. Never had a problem with it and it always worked flawlessly. The ability to swap from 4x5 to 6x12 by merely sliding in the appropriate holder is a great boon to my landscape photography. I also drew the 6x12 guide lines on the GG so it's great to see right away what framing may prove best in various shooting scenarios. It is a touch heavy for my wooden monorail camera so I support the rear standard with an empty prescription bottle.