yup, i use duo lock snaps on everything and catch plenty of fish. makes fly/lure changes a helluva lot easier.
Does it give the fly action or does the fly track straight. I have caught fish on those wiggle disks last year first time trying them. I
You can tie a fly direct with a loop knot, use a quick clip or a duolock. None of these connections give your flies action! They'll always pull straight except maybe at the end of a turn or wave action. Even given those, "fly action" is negligible.
Not saying they don't work cuz they obviously do!