Go for it, the more we preserve the better
I Have one that has just become useable. It had a fault that hung the shutter on release, now fixed. As those above have mentioned, this camera is an engineering masterpiece, rock solid, ambitious at the time and impossibly over complicated. When considering it next to a contemporary Nikon F it seems that the Japanese asked the question "how do we make this work as fast as possible?" and the Germans asked the question "how do we make this as expensively as possible?"
The aperture interface has 9 internal gears, two full sized ball races that skirt the lens mount opening - one in the camera and one in the lens - a spring loaded gear driven aperture control ring that engages as the shutter is released. All totally bonkers compared to every other mechanism I have seen. That said, all of these components are beautifully made and once returned to factory state - that is without the old grease and cleaned of atmospheric grime - they work perfectly!
I also find it quite good to use, the viewfinder is very bright even with the aperture closed down. It is easy to focus once you get the hang of only using the micro-prisms and split image. The shutter makes a satisfying sound as if all that money you paid is worth it and for a 1958 design the meter can work in decent light and can be read in the viewfinder. On this latter point I find my guesswork much faster and more accurate, especially at any time before 8.00am and after 5.00pm.
The ergonomics are quite good for all photography except street work where the slow shutter-cycle, the noise and the size is distracting. Not a Nikon or Leica. I have only the 50mm Blitz Planar which is superb, very well balanced on the camera and quick to focus right down to 20". I have seen inside this and a 50mm F1.4 Nikkor of the same vintage - even though the nikon is very well made, the Zeiss is several leagues up in build quality - think 1960's Mercedes vs Ford.
Probably the best 'vanity' camera you could acquire. People stop and ask what it is, it looks like a 60's Rolls Royce, it makes a sound that says "there is plenty going on inside here and it cost me a lot of money" and it represents the greatest of Zeiss' ambition.
Caveat
I would not buy one without trying it with a lens attached and held by the thumbwheel at the largest of it's aperture settings. This is the setting that will promote shutter hang and cost you either time or loads of money to fix. You can mimic this by depressing the lens button seen at 11.00 o'clock on the camera bayonet flange if you do not have a lens available. This fault does not show itself otherwise - a camera alone fires easily and seems totally fine - it may not be once you fix a lens to it.
2. A lens that is frozen up (see Henry Scherer's pages) can be unfrozen by stripping it down to components and heating the lens helicals in the oven. Now you may be audacious to this degree, I am not.
3. I think the cloth shutter curtains will not last as long as the camera and guess that there will not be a cottage industry kicking off to save them like there is for old Leica and Contax models.
I set myself an ambition to acquire as many of the great mechanical cameras that I reasonably could. I have always owned a Leica and have 3 Nikon F/F2, a Rolleiflex F2.8F, Contax ll, lla, llla. An now, more a peccadillo, a working Contarex. Maybe a Hasselblad in my future, otherwise I'm done.
Further information here:
https://www.flickr.com/photos/31778846@N05/16466293858/