My decision to buy the GF670 (ordered in Feb) is based purely on my experience using my 1950's folders. I love folding cameras, (why, I don't know) and the added attraction of shooting in 6x7 for a change. The camera is quite large and feels a lot bigger than my Agfa Super Isolette but feels a lot lighter. It's very comfortable to shoot with, nice grippy rubber on the body and a big bright VF that I can see the shutter speeds in while wearing glasses. The camera feels to me like using a BIG 'M' body. Shutter isn't just quiet, its extremely quiet!
I did buy the case and lens hood for it and these are not cheap... the hood is plastic and cost about $100. I do feel the camera is priced on the high side but..... I just plain wanted one.
Image quality... This is where I'm stuck. I'd love to show you some of my boring pictures but I collected the camera from Dirk on my way to join a ship in Japan. I'm still stuck on that ship and will be for another 2 agonizing weeks before I can get home and develop the film. There has been some images posted here by somebody else on this forum and I doubt Fuji would produce a 'bum' camera so I'm expecting image quality to be good unless there is something wrong with this particular camera.
A friend here did show me a review in a Japanese magazine and he said the review was good and that the reviewers said the image quality was good. I don't have the magazine though to scan and mail to you.