I like the comfort and lightweight the most. Easy to put on. Doesn't weigh you down when hiking into an ice climb. Fits well with Black Diamond Cyborg crampons.
Moderately insulated, so wouldn't be ideal for high altitude climbing. I've worn them in 5 degree F temps with a mid-weight sock and they kept my feet reasonably warm.
This review was written in the old system and had content requirements that are different than reviews written today.