Worked great at Red Flag
In a former life (seems like) as a US Army Cobra driver I recall a Red Flag we attended in which this capability was found to work quite well in certain circumstances. One of the biggest things that came out of all this was the fast-movers lack of understanding of our ability to take "off-axis" shots at them with our 20mm gattling gun. On the Cobra this weapon is capable of swiveling up to 110 degrees left or right of aircraft centerline. This capability was quite devasting in certain engagements. I know the Apache has this capability as well but I am not sure of the parameters as I turned down my chance to fly this aircraft in order to become a fixed wing whore. Additionally we discovered that F-16 targeting computers automatically dropped out anything that moved at less then thirty five knots. Using this to our advantage we were able to hover slowly and stealthly over roads and countryside to ingress/egress areas that had heavy air coverage.