Yes I use the knee binding. Last year when I brought new skis I was on the fence for a while . I felt I’m not getting any younger and I prefer moguls rocks trees and cliffs to groomers so I said why not. I ended up with their carbon model which weighs less, but definitely still more than traditional ski bindings. Of course with last year’s snow drought I only used them a few days. All things considered I am very happy with them and hey if they prevent a injury even better.
Here are my knee bindings on my Praxis skis