I use the Kessler system including the QR base. The only thing I have a problem with is that some "Arca" plates on my MF cameras slip out of the lever action Kessler base - the attachment ribs on their their "Arca" TYPE plates are spaced slightly wider than some Arca etc plates. Most screw type clamps have enough extra width capability to not have a problem, so the Kessler QR plate in a Monoball QR base etc works just fine.

I have a couple of thin strips of shim stock that I use when putting a non Kessler plate in a Kessler clamp if need be.