Super fast transitions, that's what these guys give you.
I ride with ski tourers who are way faster than me going up and they used to be way faster than me in transitions. Not anymore!
Last years interface was great and I am sure some people could work them so you could switch them to downhill mode without taking your gloves off or bashing them with a small hammer, but not me. These guys, totally different story.
Binding plates are machined instead of cast from last year. What does this mean? No more bending plates at inopportune times.
And those climbing wires from last year, ugh. The risers that come on the Prime are a world easier to maneuver (although i have had issues with one side high riser not staying up).
I can't compare to other interfaces but compared to last year's Splits, the Primes blow them out of the water.
Also they are a good binding too.