I love that thing, my first sortie in it I scored 2 kills, and I sucked in the Ostwind, it's much easier to kill planes with it then the flak is, and the reason for that is, is in the flak your only getting off a few rounds ever second in it, with the Wirblewind your getting a much higher rate of fire, making it easier to land hits on the planes.
This will definitely put a damper in vulching a base that still has it's VH up.