I just switched from Manfrotto RC4 and RC2 quick release plates to Arca-Swiss (AS) clamps and rails/plates. I decided I needed to try panoramas with the lens shifted back to the nodal point so that was the impetus for the wholesale change. In my case I liked my Manfrotto 410 geared head and there were no obvious (better for about the same money) AS system alternatives. I also have and like OK a Manfrotto 322 side grip ball head.
So I ended up getting retrofit pieces machined and sold by Hejnar Photo: www.hejnarphotostore.com
partly because he was available for advice on some of the bottom or foot plate choices. The owner is a photographer, too. Seemed to offer common-sense advice. Among his line are AS base clamp pieces machined to bolt right on the core castings of my two Manfrotto heads retaining the height and solidity.
I regret that I didn't start out in this system so have to sell my Manfrotto plates and the Manfrotto L-bracket (based on the better RC-4 plate) but I will benefit in future fast-moving shoots calling for the tripod to shift constantly.