Agree with 2wheelsforme. The AngryStad and other stacked (2 layer) shields seem to do the best job of controlling buffeting. It's because the air is allowed up behind the shield to reduce the low-pressure suction that collapses the air coming across top edge.

For mine, at its low setting (around chin height), I get a bit of a breeze and very slight buffeting at highway speed when in traffic (none if traffic is light). At its tall setting (around nose height) there is zero wind, and almost car-like in air control. For reference, I'm 6'1", and long in torso, and am using the 15" shield, which the manufacturer recommends for my height. I put linear actuators on mine so I can adjust electrically to suit my taste for the day.

Before the AngryStad, I used a Clearview Full Wing Shield +4 (i.e. it's 4" taller than a stock Full Wing shield) which put it around nose height. It performed about as well as the AngryStad in its low position, despite actually being higher. It was never able to produce the still air that the AngryStad can at full up.