They work ok, I had them on an Active Thunder, they break the wind up more than deflect it, I used them up to 80. The biggest problem was when they popped up at a certian speed, before I put a rubber bumber pad on they would make a loud bang. If it was raining or really buggy they would keep the direct hits down. You can see this one, I had 3 but kept the middle down. If you stood in the companian way with the middle up it was a dead zone with no wind at all.

I had mine customized from finneys. They have held up very well. They can make the rails any length and height, also the windscreen itself in a variety of sizes.

Here is a picture of mine with the Windaways on......

mine work pretty well on mine just enuf to make it enjoyable at speed :