I bought TrackIR 4 PRO a while ago and I love it. IT can be used with many games. And you don't gotta turn your head very far for the head ingame to turn. Well worth my money. I would definatly say it will also be supported in ArmA II, if you haven't already, some of the ArmA GC 08' vids, you can see a trackIR 4 on top of several of the monitors.