Ernie Flory wrote a review of Petzl Attache Locking Carabiner on January 2, 2013
Familiarity: I've put it through the wringer
This crab holds my keys securely to my belt loop with aplomb. Even the gal who mixes up my super-duper-sized-double-caff-non-soy-supercream-extrasugar-coffeeflavored-coffee complimented me on my keyholder choice. If that's not an endorsement, then colour me anodized gold. When nobody's really looking, I use this exclusively to set up toprope anchor systems and on hanging belays because it opens easily, rope passes smoothly, and it closes securely. Plus, it's kinda not heavy.