BTW, today I received an email from MAC and they have finally finished destroying the M645... They now have an all/only digital version, no more removeable back. First the viewfinder and motor drive became integrated, now the capture system. I sent them an email expressing my concerns about their fix to a problem that did not exist. I would never buy an AF because I couldn't remove the finder, I'm even less likely to buy this thing (and I like digital for many things). I see this new thing as a flop waiting to happen.
Which are you referring to? The 645ZD is not an integrated back system, it's simply a package deal on a 645AFDII body, 80/2.8 AF and the ZD back.
The ZD DSLR has been around for a while although it never became widely available, and it seems that Mamiya has chosen to pursue the 645ZD model over the integrated model, in fact MAC's website no longer lists the ZD DSLR as a current model, indicating that they've chosen the multiformat route over the integrated platform.
As to integration, some was inevitable, particularly the winder, which always was awkward as an add-on. I'm not fond of the lack of removable finders either (and was discussing this with a pro digital shooter a couple weeks ago, he was distinctly unhappy with the lack of waistlevel finder, unlike the Hassy H series. The H's have their own issues with excessive integration though)