Rollerskis with electronic brakes

Has anyone tried these norwegian rollerskis with electornic brakes? I like hill climbing on rollerskis (200-500m gain at 7%), and for years I've been dealing with the downhill part by shuttilng a road bike to the top, or by running/hiking back. I wonder how well these rollerskis can handle continous braking on a 7% downhill. https://mysmartbrake.com/category/roller-skis-with-electronic-brakes/