SUPER lightweight (but no compromise on strength), easily adjustable (turn-wheel for around-the-head adjustment), very breathable. the light color (i got the white one) and vent holes help keep my head cool when i'm out in the sun.
Light, comfy, breathes really well. You'll forget it's on so you're more likely to wear the damn thing.
Not the most durable helmet out there, although the full-coverage foam means it's probably more useful than most in an inverted lead fall, so it's ideal for sport climbing in areas with limited rockfall risk.