These ice screws are a dream to use; they start easily; they go in quick with the grinder-knob. When your second takes them out, the ice comes out of them relatively easily; he/she isn't stuck beating them against the ice face forever and cursing. My wife has lead with these screws in mittens and found the grinder knob easy to use, so I have not experienced the same difficulty as some reviewers mentioned with the knob.
I have also used the Petzl Laser Sonic and they do not perform half as well. They only made me love my BD screws even more. Well worth the price!
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