So far so good transitioning to the 67 from my Mamiya ProTL 645. The ProTL was FOOL-proof, assuming so wedding photographers in a rush wouldn't do something that would cost them a roll. I've put five rolls through the 'new' 67 in just over two weeks. Film loading is no problem, while unloading is a bit more unnerving. Just a few tense moments trying to get the film out in the car. I did lose the first frame on a roll yesterday. I had just pulled the body/lens from my pack and as I was mounting it to the tripod head my finger hit the MLU button by mistake. I thought that the "emergency release button" might drop the mirror, but pushing it in didn't do squat. I had to push the shutter release. Oh well. The ProTL has a manual switch for up/down. Am I missing something, or are you committed to fire at that point? Other than that, I think I had one of the best days shooting yesterday. My wife and I made our way down the Mendocino and Sonoma County coastline yesterday. A bit of misty rain, deep colors, great atmosphere. Can't wait to see the results. Anyone else care to confess about a dumb mistake they made over the weekend?