I had the Memphis Shades W/S but had a chance to buy a National Cycle Wave 10" on sale. (Love a sale.)
I've got a couple of rides in, about 500 miles, but it seems I can hear the radio on my Ultra better and the wind seems to flow over.
I have noticed when the bugs hit the W/S, they seem to slide over the W/S instead of getting spattered. Kind of like a kids slide.
That was the plus side.....
The negative side is because of the design, I can't use my W/S bag or the Garmin faring mount GPS. No room.
Have to see if I keep it on the bike. I want to take a CC ride, have to see if I want the W/S bag or Garmin GPS.