So. Good and bad with this.
Yes, it cuts the wind noise.
Yes, it reduces the buffeting at face level and makes riding with the visor open more than a crack quite a bit more comfortable.
No, it isn't really windscreen quality optically. Mine has heat ripples inside the acrylic that distort the view quite noticeably, and make it hard to have a clear view on the dirt (it smooths everything out, visually).
That said, if I can find a broken windscreen that I can salvage the top half of, I will make my own and use the mounts off this.