Not sure if this helps since I had the full Fairbourne screen fitted by my dealer to new car, so no experience of improvement. Decision to fit one though was based on experience of M3W club owner who claimed it was the single biggest improvement to his car, in terms of weather protection, noise and general comfort.
The factory were asked not to fit standard screens (supplied in wrapping) making the dealers fit that much easier. At the time (March 2016) the factory full screen had only just been listed and was inevitably not yet available.
