Never used one myself, but there's plenty of good reviews both on this forum and others. Being USB, it should work directly when plugged in without any extra programs or drivers, also on a 64 bit system. The game (AH, I assume) accepts any stick that Windows recognizes, even multiple sticks.
There's good alternatives, too, in the price range. The Thrustmaster T.16000m is ultimately accurate because of the HALL technology it uses instead of potentiometres.
One hint: Teach your son to use his joystick like a real pilot does. Cranking the stick beyond limits doesn't improve combat maneuvers, vice versa. It'll only break the stick. I've read the FAF pilot pocket manual from early fifties when they still used propelled warbirds, the movements of the stick being printed in full size. The patterns of stick trajectories would each fit on the label of a matchbox! Also, people who have seen wartime aces try AH have told they held the stick very gently, doing only small movements.
