Wild Country's Eos Screwgate Carabiner has the light weight that alpinists and multi-pitch climbers look for. Wild Country hot-forged the carabiner and constructed it with an I-beam back for reduced weight, and the snag-free keylock nose makes this carabiner ideal for anchors and clipping indirect.
Hot-forged for lightness
Light and strong
Familiarity: I've used it once or twice and have initial impressions
I have been a huge fan of WC's Helium biners, so I have tried their other offerings also. These are light, strong, and open wide up. I have had no complaints.