The Petzl Scorpio Eashook is one of our more expensive Via Ferrata sets. However we would say that for regular users the cost is often worth it.
Looking at the Scorpio you will be able to see the biners are not a twist lock. The mechanism on the spine of the biner is the means to open the auto locking gate just by squeezing it in your hand which you would do do anyway. When the spine is released the gate auto locks. The lanyards are webbing with internal elastic, which means that they do not get as much in the way as if they were not elasticated. You will also see that there is a 3rd attachment point in the centre where a carabiner can be attached (not included) for resting on rungs or use on Tyrolean traverses. The actual shock absorber is kept in a zipped pouch, so that it is easy to inspect and will protect it from unnecessary abrasion.
All in all a good choice for a regular Via Ferrata user.
Features Absorber is stored in a zippered pouch: Protected from abrasion. Condition can be easily inspected (practical for rental programs).
Retractable lanyard arms are practical to use: Reduced bulk. Carabiners are easily reached.
Carabiners are simple and quick to clip for increased safety - the gates automatically lock when you do not have the palm of your hand on the spine of the biner. Third, shorter arm attached to absorber for clipping to the bars (for resting) or for progressing closer to the cable. Webbing loop allows direct attachment to harness with a girth hitch.