I had a clear bra on my '09 328i. Good for protecting from rock chips. The only problem is that it turns yellowish after a few months. Unless you keep your car in the garage all the time..
I am not getting it on my F30. Just avoid following any big trucks/dump trucks on the freeway
2016 F80 M3 Alpine White / Sakhir Orange / DCT / 19 Black / Michelin PSS / Delivered Sept 18, 2015