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Then, a V mount back is of course not only usable on Hasselblad V, it gives many options. Technical cameras and Mamiya RZ are good alternatives, for example. And there were also Leaf Aptus V mount backs, but I have not seen any advertised.P+ backs are built like tanks, normally they don't break and they don't need service.
I still have a P25+ and had a P40+ and they never had problems.
You can still buy new CF Cards and the batteries are still the same as in the newer Phase One backs.
Tethered shooting with firewire isn't possible with newer Mac's.
With the 40 MP it is a little bit difficult to focus on a Hasselblad V, that's why I recommend the 25 MP backs.
The files are great and very robust for post production.
You can work very easy with them in Capture One.
My 2 cents,