Robert Connor wrote a review of Black Diamond Whippet Self-Arrest Ski Pole on November 18, 2008
Sure, they cost more for one than most poles do for two, but they work quite well. I think they are better for preventing a fall than for stopping one. They work very well on the climb up and give a bit of comfort on a steep skin on hard snow. They are not a replacement for an ice ax on very steep climbing. When the conditions are right they are great. If the snow is not going to be hard enough that they will help, leave them at home, or take the pick off. I think the likelihood of a stabbing is small, but why take a chance if a whippet won't help anyway? They really stand up to the abuse the ski alpinism can deliver. I do wish they collapsed shorter though.