Just reporting my personal experience with the OEM wind screen. First I should say that I love the way it looks on the bike. Only screen that does not ruin the look of the bike IMO, probably the opposite.
Had decent weather past 2 days and got to ride the bike with the screen for the first time. I noticed so much wind noise, I mean a lot, no buffeting but loud wind noise, even in low speeds of 25-45 mph, and worse in the highway. I was thinking I don't remember the bike being this noisy in the couple of time I rode it without the screen.
Figured maybe the wind screen is directing the wind upwards towards my head instead of my chest.
I decided it to take it off and see. As soon as started riding I could hear the difference, much quieter, albeit more a little more wind on the upper chest. I was still skeptical that it would make such a difference, so I put it back on instantly and tried it again under same conditions, much louder wind noise.
I also ride an Indian with extremely loud TAB zombie exhaust, but the wind noise on the R3 with the screen was louder. So it was either I start using the ear buds again (which I no longer need while on the Indian with full face helmet), or remove the screen.
Anyway, decided to take it off for now. I'd rather hold on the bars a little tighter than go deaf or bother with ear buds every time I want to ride.
In very cold weather I may reinstall it, but no sure.
Just my input for anyone like me who was contemplating whether it was worthwhile getting the OEM wind screen.
Ride safe every one.