Interesting take. I rarely use autofocus so it's not a priority. Video isn't important either. I think the system would be would be more of an addition to what I use than to replace what I have, so that's a good thought process. The other message you mentioned support for the item also. Since it's a Hasselblad I just assumed that Hasselblad would fix it should anything go wrong.
I don't do color very well, which is why I wanted a digital back. Shooting color chromes (slides) and then scanning them is okay, but there's a lot of work to get the colors right to just match the original slide. I love black and white film, so I'd stick with the 'blad for that.
Oh, I'm okay with ISO 50 - 100. I used to use Kodachrome 25. On the Nikon D700 it's really easy to shoot at ISO 800 and above, but that's a different way of shooting than using medium format. I'm okay with using tripods, so a slow ISO back is okay too. I guess I just need to decide if I want to spend the money on the back or just get a new DSLR at some point.
I think the "problem" I'm having is that the D800E and A7R seems to perform just as well as the Hasselblad back. I have an adapter that will allow me to use the Hasselblad lenses on the Nikon cameras. The CFV-39, according to some, has dynamic range and color to its advantage, but all the other advantages go to the smaller, faster formats. This is what makes it a hard decision.