I've been shopping for a tri-state self-locking carabiner for clipping into personal anchors but made a mistake and ordered a twist-lock 'biner instead :) Since product return is a hassle during those zombie outbreak times, I decided to keep it. It's a lighthweight offset-D UIAA certified 23kN load-bearing carabiner.
Now, what would be the best use for it? :) I won't be clipping into anchors with it, I prefer a proper tri-state carabiner. Using this twist-locking for auxiliary work such as haul bags or tools seems to be a waste, on the other hand!