I think the Fuji rangerfinders in all their manifestations (645 manual
and auto, 6X7, 6X9) are some of the most under-rated and
under-appreciated cameras on the market.  My 15 year-old GS645S (the
fixed-lens manual predecessor of the 645Zi) traveled all over Europe and
beyond with me for ten years while I was based in Paris, despite my
ripping off the shutter speed ring in my bicycle spokes (which I then
was able to repair myself, despite not being familiar with the innards
of the mechanism), and has given me most of my best shots during those
years.  Light, rugged, simple, with a killer lens--what more could a
Leica-trained, medium format junkie want.  It's still cranking along
without having seen the inside of a shop and still producing great negs.
 As is my five year-old GA645Zi and my G670III.  The Mamiya 6 and 7
were sexier, but a whole lot more expensive, and not one whit better in
lens quality or reliability.  I'd love to see Fuji bring back the GS645
manual models, but I'm sure the market would never support it now that
everybody's moving to digital.

Well I can't adjust the shutter speed using one hand yet.  I usually use manual
on a tripod but do want to set the speed as I fix fstop for depth of field.
The whole manual operation is not very easy.  It would be nice to find a camera
with a real rangefinder and better manual operation that still had that great
zoom lens and small size.  But I did step into this camera as my easy use
system from using old Agfa folders.  So I feel it's not too hard to use.  But
I'm still looking at the instruction book to figure out how all those buttons
are used.  I have to say that image quality is quite a leap over the old
folders (Solinar lens) and seems as good as my 6x9 Century Graphic with newer
Apo-Sironar.
Chuck