And yet there have been products on the market for decades that are stronger, as much as 10 times stronger when levered over an edge.
I've been using the Kong Tango. It's fast strong, and durable if you clean and grease once in a while. The Proclip has a lot going for it; very hard to release accidentally and nearly corrosion-proof. The ISC SH 903 requires two separate unlocking actions before the gate can move; about the only thing more secure is a moused screw pin shackle. All of these open wide enough to clip a 1-inch railing and are workable with gloves. That's why I'm out testing them in January and February. Read Practical Sailor for the details.
All great products.
How do you keep the tethers out from underfoot when you aren't using them? Around the waist like a belt, naturally. I picked that up from a Volvo race guy.
You can spy it just under my elbow, completely out of the way.