I have been using the Mamiya QR device & plate inturn mounted onto an regular arca swiss plate (for use on my B1) on my Mamiya 7II. It works though, it adds a bit of weight and its rather bulky. It seems like getting an RRS or Arcatech plate would be a good idea.
I have no chance to compare either plate, was just wondering what everybody's thoughts were on the two.
Thanks for the answers. Just ordered two RRS plates, a few minutes ago. Tom, you do exactly the same thing I do, when I am not shooting LF. I carry two bodies, one with color and the other with BW.
I would get the Kirk L bracket for the Mamiya 7 instead. I use one and it replaced my RRS QR plate. The L bracket adds some bulk and weight, but not only does it act as an Arca type QR, but it also allows for switching between horizontal and vertical positions quickly, accurately and without any incident.