Thanks guys, but like I said I'm not concerned about compatibility between plates and clamps or any of that stuff.
I had some gear stolen and need to replace it. Part of that includes a Kirk L-bracket and Kirk foot for the 70-200. As I look at replacement options, I see Kirk, Markins and RRS as all offering basically the same things for basically the same prices. Other than potential compatibility issues, is there any reason to believe one is better than the others?