I had one, hated it and sold it. The idea behind the Klock Werks windshield is that it creates a swirling area that comes up and around the windshield (look at their video on-line) pushing the air up and over the rider. Unfortunatly because of my limited hight (5'5") I am forced to sit forward on the bike (Electra Glide) and I sat right in the middle of the upward draft that this windshield creates. It caused severe buffering under my helmet forcing my head back creating pains in my neck and shoulders. I recomend this windshild for people who are taller, and do not recomend it at all for anyone who use a seat that pushes them forward as it will put you right in the midlle of a wind tunnel. Also when looking through this windshield should you need to, it distorts everything, makes it look all out of shape.
On the cool factor this winshield looks awsome.