Here is a perspective prospective Zero commuter screen buyers might want to consider:
I'm disappointed with the commuter screen. 2014 zero S, just installed the screen and have been messing with the angle adjustments. I was so excited for it, was hoping it could help to streamlining highway aerodynamics a little bit better, but the thing changes a quiet, smooth, and pure ride to a ride full of pounding turbulence that gives me a headache and makes my ears ring after the ride. I am constantly moving my head forward, back, up, down, and behind the screen, just trying to find a quieter position with less buffeting.
While before you have an even spread of wind and weather all over your torso, the windscreen just pushes the wind, now faster and with more turbulence, onto your head, shoulders, under the helmet at the neckline, hands, and arms. For summer riding... This then means that chest vents in your jacket don't work.
If you prefer to tuck (was a road bicycle rider, so tucking is familiar to me) the windscreen in your face gets in the way. Leaning forward into the wind used to help take weight off your arms, so now with the windscreen my arms are tired from having to hold my body up.
Was it worth 2 days of pay and hours of fiddling with it? I don't know.