I were on stubai steel screwgates for years. ( a 1cm piece of rubber hose stops em coming undone) I think more often people forget to do em up rather than them come undone though.
Found some alloy autolock ones im happy with but cant recall brand
Auot locks can not shut properly too though. Only takes a bit of sap or bark.
ALWAYS make it visual when you attach anything you depend on. Hearing a snap aint good enough.
Steel only for rigging.