Where's the benefit and advantage to justify the cost????
I had a chance to use these on a climb with my buddy as we needed a few more stubbies than my rack had.
Based on the price and weight alone of these I couldn't recommend them as a good buy. There's nothing that sets these screws above BD Express or Petzl Laser Sonic screws.
The pull out knob can also ice up on multipitches if the waterfall has a little bit of a run on or around the screws.
Definitely not worth the cost.