Nearly non-existent vibration at 70+ mph. And this is with some high wind speeds out here in CO.
I took a test drive shortly after installing and attribute wind noise to the empty Thule roof rack: Driving with the Aeroskin II hood deflector — Bronco Sport (2023 Big Bend) - YouTube
I did matte black vinyl letters on my ‘23 Big Bend. I like that the white outline makes it pop more, rather than muting it (at least on the front grille).