I manufacture and sell acrylic wind blockers for both the ND and the NC. I’ve been doing the ND version around four months and then added the NC around a month ago. I’ve sold around 100 so far here, on eBay and on Facebook. I’ve had nothing but positive feedback so far. Many buyers commenting on the reduction in buffeting. Also the visibility is much improved.
Check out the feedback I’ve received on the ND version.