There have been documented instances of the Claw failing structurally. Not recently, so maybe that’s fixed.
Ive used the Fly Ties on my plane for over fifteen years, and never needed more, including during some no joke Midwest thunderstorms.
But, bottom line, so much depends on soil consistency wind direction and velocity, ferocity of gusts, etc, etc.
As to “screw ins, I’m assuming you’re not describing dog tie out stakes. One year at OSH, big wind came up in t-storm. J-3 parked down the row from me was tied down with those, ripped them out and jumped on top of a C-150. My Fly Ties were fine.
MTV