I have no scientific reports or numbers to go on, but I do have the "hair style" test, and with my wind screen, I arrive looking the way I left...not like I've been through a wind tunnel. I drive with my windows up going high speeds to keep the wind at bay. That's just me. In the NW, we have cool evenings, so with my wind screen, I can keep the top down, the heat cranked, and feel very comfortable. Plus, the radio is easier to hear, and I can actually hear my cell phone and take the occasional phone, (hands free) if necessary.

I am tempted to go for the lighted style, but I like having my roll bars covered, and that style doesn't provide that type of coverage.