"I would be concerned about parts, based on what happened w/ my Fuji GS645. It was bought from KEH (the old KEH), and when the shutter needed repair they did the work under their warranty. When it later needed the shutter fixed again, they kept the camera and refunded my money because there were no more parts available to fix it.
I loved the images from that camera, but if you can't get parts anymore......."
I've had a bunch of the mechanical Fuji Texas Leicas (6x7,6x8,6x9, both w 65mm and 90) starting with the original 690 interchangeable lens model. Mine had taken a 60 foot fall...& still worked. I never had the slightest problem with any of them. They're leaf shutter cameras so shutter service isn't very complicated.
Re: the "jumping exposures" might be a film transport issue or it could be caused by poor film loading technique. If it were cheap enough i'd chance it....but there are lots of them around, although prices have risen dramatically in the past couple of years.
Historically, the 6x9 cameras are far more reliable than the metered 645 models which were known to have problems.