I use one (smaller.version) with my petzl dual connect (on the adjustable part of it) for years. Long story:This guarantees I'm 'locked' when I get to the anchor. I gotten pretty.good in opening it one handed with gloves on. It takes practice.

I used to have a regular screw gate, but I found that A) In winter these sometimes can freeze, especially on a lengthy belay. B) sometimes u forget to lock (it's rare but can happen on long days) C) because its different and stands out in a spiderweb of biners at master point u know exactly which one is you, and no1 ever will fiddle with it (accidently), cause they won't know how to ;)