In terms of wind buffeting, I think the buffeting is caused by helmet shapes not being wind tunnel tested, and also cheap helmets have a very large shell with a lot of padding to make the helmet fit. The large shell will create buffeting. I purchased a Strada II Sedici helmet, which is very similar to a GT Air 2, but is only 1/3 of the price. With the stock windscreen the helmet slices through the air like a knife. But with an old cheap full face helmet I have, the helmet will start buffetting at normal highway speeds. The Strada II is a very small helmet. It also has a spoiler on the back. The Strada II is super slick in the air stream. With the Zero Gravity touring windshield, I actually get a little buffeting with the Strada II helmet, but it only happens briefly and only with certain head positions and only when above normal speeds. At 70mph, it's glassy calm. I'm 5'11" with very long arms, and very short torso.