In article , nospam@---see.real.addr.below says...

[Kirk QRs or Really Right Stuff QRs?]
>that is the question.
>Is there much difference in the two arca style QRs?
>How about the camera plates?
>Is it worth the cost difference?

The RRS plates and plate grips are designed to be
relatively compact, and they are well-designed, and
well made (and the camera plates with lips for
preventing rotation on the camera bottoms fit
exactly, in my experience). I can recommend RRS
gear (though I have not used Kirk gear, and it
has a good reputation).
Hope This Helps