Leo Ahrenswrote a review of Black Diamond Express Ice Screws on November 11, 2015
Familiarity: I've put it through the wringer
Probably the scariest tool I carry with me while skiing in glacial terrain. Left on my harness for easy access but rarely used. The most likely tool to stab you in a bad crash and arguably the most important tool to save your life if one was to fall in a crevasse.
In my experience 8 out of 10 times I have used this tool as a drill rather than a screw. Two holes drilled as a V into a solid block of ice make for a solid anchor in the ice to slip your rope through. (we hope) Just don't tell your mom you trusted frozen water with your life.