Also have it in there all the time, even when the hardtops on. Visibility fine in the day, and headlights are filtered at night
.. plus, nosa will hate this, but mine also has an alpina logo in it (like a watermark) which looks pretty cool 8)
my perspex one seems to cut most of the wind from the front of my head and a little bit runs down the back of my neck which is quite nice. do the little role bar ones make much difference??