Steve - Thanks man, appreciate the kind words
Andy - Learning curve is actually way harder than I first thought. Worst problems are it's ability to resolve colour. It will take the slightest yellow cast from a cheaper softbox, and it will almost look like you gelled the light with CTO. It's actually quite a hinderance. Shooting with hot lights is appearing to be the worst challenge of all, as all lights seem to emit a lightly different spectrum, which the camera picks up with intensity. Whereas the bare bulb of my Protofo heads appear completely white on a Canon 5D2, or any 35mm DSLR for that matter, on the Hasselblad, they have a very blue hue to them.
With the modelling lights on, 35mm gives a yellow hue, but with the Hasselblad, a very deep unflattering purple. It's not a case of "Oh, this is how it REALLY looks!", it's actually quite irritating and hard to deal with.
There's no Auto WB, and while that may not affect some purists, it's annoying if you just want to pick up the camera and shoot some tests.
Other things like focus are very difficult. When using the HTS 1.5 tilt & shift adaptor, the visibility through the viewfinder is obscured quite dramatically, and since there's no real Live View mode, focusing can be very tricky. It's really made me appreciate some of the automatic features of a 35mm DSLR that I took for granted.
Auto focus is crazy accurate. I'm off the opinion that this camera is practically incapable of missing focus. Problem is that there's only one focus point, so care is needed to make sure you activate the pitch/yaw sensors to recalibrate the focus when you recompose.
Software-wise, I use Phocus, which comes with the camera, and is amazing, and I use Photoshop CS6. In my studio, I'm tethering to a late-2012 i7 Mac Mini with 16gb, which is plenty fast to process the files, but not fast enough to work them in Photoshop. For that I use my 2013 iMac at some, which has 32gb of ram. It's very capable of handling the files, but I'm not sure I'd want to use anything less powerful. You probably could, but I don't think you could have anything else open at the same time.
Funnily enough, storage is not hugely different from a 35mm DSLR. While the file size may be double, the speed you can shoot as it reduced by 500%, so a day's shooting is yielding less pictures. With a DSLR I can machine gun shots at whatever recycle rate my lights are at, but with the MF camera, I'm limited to 1.1 FPS.
Overall, it's a steep learning curve, but the overall quality of the images outweigh its difficulty in use.