not once in 15+ years of rope use in a variety of fields have i ever had a screwgate carabiner come undone. I can understand that NOT EVERYONE will check their biners before during or whenever on a treeclimb, but i have 100% confidence in a screwgate for treeclimbing. Work is another issue, i will use rope snaps because i have to.

I have hade ropes end up in sich a way around a double locker biner, that the outer part of the gate has slid down, and the gate was susceptible to being pushed open by rock, limb or another rope (under tension). That being said, I agree that a double action locker biner should be used by those entering the treeclimbing realm (treeworld), and that screw_link_s (i'm talking Maillione Rapides ONLY, not screwgate biners) should only be used by experienced on rope persons, who check and recheck their gear frequently before , during and after a climb. Too easy for someone with little or some experience to forget to check a screwgate Biner.

I happen to love the Maillione Rapides, the large 16mm pear is one of my favorite (and cheap $$$) rigging items. I can get the large pear for 12 bucks, it solves many rigging problems for me , by allowing webbing slings to be spread out and not contact each other.

one thing that does bug me is a lot of people are under the impression that if someone uses anything other than a double locking biner, they are putting their life at risk, and that the screwgate or Maillione rapide will somehow fail up the aire, and the on rope use will fall. I'm dealing with now at work. They are used to double locks only, and have this weird fear of anything different.