Thanks for all the kind replies. So far I have developed three 120 rolls and have eight to go, so there's more to come.
The Mamiya 7 is a special camera for me. If I'm not shooting it, then it's the R-D1. Nothing feels quite like it when I frame a shot and know that I've got such DR and resolution at hand, with such a gentle 'click' of the shutter. And it is a joy to use. As much as I'd love a Xpan, the pano kit works fine as well and can be picked up new for around $100.
Anyone thinking of getting one, you won't be disappointed.
Next will have to be a 50mm that everyone raves about.
Cheers - John