For me it didn't do any good. I just added more noise and turbulence for me, but as usual with wind screens it depends on your lenght, seat hight, riding position etc.
I ended up cutting my stock screen down with approx 10cm. to get more clean air above the shoulders. That's much better for me.
I'm 180 cm tall using standard seat.
BMW F650GS -05, F800GS -08