Brunowrote a review of Black Diamond VaporLock Screwgate Carabiner on November 25, 2013
Familiarity: I've put it through the wringer
January 2015: UPDATE: I used them round my crag in Austin and then out in Yosemite for 9 days of climbing. I have no replaced all my heavier large biners I mentioned below with these. LOVE THEM.
Original review: I bought these after a long-review of the different locking biners available. I have some BD positrons which are small and great for extending anchors, but heavy. I have some BD rock locks which I use primarily for belay. Like it but very heavy. These all worked fine when all I did was sport climbing. Now that I am hooked on trad and multi-pitch, as I added to my rack, I knew I had to think about weight. The VaporLock is what I landed on due to size, flexibility, and especially weight. I have used them belaying, anchoring, and extending anchors with slings and like it so far.