If my memory serves me correctly, Scott tells yourightin their instructions NOT to use a metal loop with their releases.
As far as a string loop goes, I think anyone who shoots a release anddoesn't use one is foolish. I'm not trying to insult anyone with that statement, but I just feel very strongly that there are somany advantages to a loopthat it should be a no-brainer. (Especially since the advent of releases like the Rhino and the Short N Sweet. You lose almost no draw length due to the loopwith them.)