They do also work as giving a bit more rain deflection as well when used as wind deflectors
Saved me from getting wet tootling along in light rain when I hired a 4 Seater from the factory with sun visors
Used them as rain deflectors the other day coming home from Snowdonia through several showers. Worked a treat. Other than that I would prefer not to have them as they effectively "thicken" the windscreen top rail which is close to my line of vision with my seat in the perfect position. I have to adjust it to quite a rakish angle to compensate. Seating position similar to a kid in a Corsa with baseball cap the wrong way round and stereo on full blast.
