TrackIR is imho essential for Flight Sim - you need it - simple as that.
There is only one gotcha, and that is that on FSX you can't adjust the view/eye point (shift-Return/shift-Backspace)while using the TrackIR as the motion tracking will continually reset it to the default for your aircraft. There are 2 work arounds - first, edit the eyepoint in the aircraft.cfg, or more easily, adjust the trackIR once you're in the cockpit so you're "sitting" higher - the latter is the easiest solution. If you use the vector hat clip (as opposed to the headset clip), you can do this easily by tilting yo