OK, OK, I gave in.
I just ordered a P67 Mirror Lockup model with 75 f4.5 from eBay Japan.
I have had a P645N for a few years, really only using it seriously for the last few months and now I also have a P645D. Even more recently I bought a P67-645 adapter (genuine), 105/2.4 and 55/4...both latest models. I have liked what I've seen with these lenses and of course the relatively low prices one can by them for.
I'm now going to sell my P645N, 45/2.8, 75/2.8 2x converter and probably even the 200/4.