He has been a pilot since 17, is an Instructor of Aircraft Maintenance at a trade school and races GM . Most competitive and determined person I know.
He used to speed shift my mothers 52 Chevy 3 on the tree before he got a licence . A real talent with clutch less shifts too.
He said he put one in his race car and took it out. Too much attention to the shifter when he had lots of other shit to worry about at 120 MPH AND CARS ALL AROUND HIM.........it slowed him down.
He said it would give my wife grief and she has raced Corvettes in slalom and only drives stick.