I have the 47, 80 and 120, and I used to have the 120 Macro but sold it. They are very good lenses with many good reports here on the 47 especially, which has a large image circle and therefore is good for stitching. If you are using it with the Precision back you have you don't need the Schneider controller - just a cable to connect the back to the lens and to a power socket. The Eyelike software then controls the shutters completely. I have one I can sell you if you want it.
Ben