I'm am sure they are going to be expensive! That is Carbon Fiber and Kevlar weave.
I like a few things about their design
1) Mounted on sliders thus adjustable
2) Designed for 5/6 point access & has the cross support built-in
However, their design is a little confusing. A few photos show their rails using the stock sliders. Then there is few photos of it using some non-stock rail "thing" (best i can tell). So helmet height may be an issue with the stock rails. I also don't like the Kevlar look with the rest of the car (perhaps if I had a yellow exterior)....