Dave,
I love it. It all seems to work fine - I have the Aptus 75 (M645 mount), a mamiya HX704 plate (which i've been told is the same as the leaf one) and both RZ67, and 67-proII bodies. I don't get EXIF, and need to use a synch cable, but that is no real hardship If I splashed out for a Pro-IId and the matching adaptor, I could do away with the cable and regain the exif.
If you've used the RZ then you'll be aware of the quality of images it can produce. I especially like the 180mm and the 65mm, but all the lenses are good. The 37 needs some correction as it is a fisheye, but that correction is aways the same (so I just make a profile in Capture 1, and apply it to all images from the 37mm)
Mark B