I bought it....tried it....and returned it immediately. I'm 5'-9" with regular stock seat, and it made things even worse. The wind was hitting me square in the center of my faceshield. Which also made the wind noise in my helmet much louder too.
The little spoiler fits up beautifully to the stock shield. Looks great and seems like a such a simple solution. But the stock shield produces cleaner air around my head & shoulders without out it. So, I'd recommend against it.
Now then, I didn't like the stock situation either. After much angst and handwringing, I followed Docking Pilot's good advice: Drank a 6 pack, then pushed the "Buy" button for the Desierto faring. Sinfully expensive, yes, but wow...does it ever work good for me. If I keep this bike a long time (which appears likely), the amortized cost over time should become insignificant. At least, that's what I keep telling myself. It has indeed made the slab rides way more pleasant.