The backers are virtually invisible. Just position them and drill your holes so the top of the backers are even with the top of the plastic front "beauty panels".
The only disadvantage I have found with the V-Stream is that due to its 4" taller height in the summer its a lot hotter to ride behind even when in the lowest position. I get zero airflow over my chest and all the upper vents in my riding suit are worthless. I am only 5'7" tall so taller riders may not have the same problem. This summer I will probably put the stock windshield back on to improve the airflow when commuting and use the V-Stream the other three seasons. Fortunately changing out the windshield on the NT is really easy.
The V-Stream is incredibly efficient at deflecting almost all of the wind off rider and passenger. This summer I got quite hot several times riding in 90 degree plus heat. I ride with the shield full up all the time. Very, very quiet. I have SERIOUSLY thought about buying the whole vent assembly for a GoldWing (about $150). With some creative effort I wonder if it could be cleanly mated to the Stream? I think it would fit. My only worry is: would the screen be dangerously weakened by cutting a rectangle big enough for the vent to fit. If it didn't work, well I have done far crazier things. Opinions please....