I did see one of the Claw tie-downs break across the cast steel arm, but it was tying down a Grumman Mallard at the time.
Obviously a very optimistic pilot! I did some searching on the Claw web-site and they claim it will withstand 1200 lbs of tension. Adequate for a typical SE aircraft, but each wing of a Mallard lifting off the ground in a hurricane, would generate 4400 lbs!