Good move - you won't regret it.
When you have it up and running you can modify the settings for up to 6 directions of movement (look up/look down, look left/look right, move left/move right, tilt left/tilt right, move forward/move reaward and move up/move down.
You can also adjust how it reacts to head movements (smooth, progressive, custom etc).
TrackIR can cause a slight decrease in frames per second when in-game, which is not desirable, especially with OFF. Otherwise, as I've found, playing around with the settings, even on my PC, can cause full screen stuttering and sometimes tearing (white flashes) at the edge of the view.
I have had trackir since trackir 1, way back. It is the best flight sim kit you can get after a good joystick.
I disagree with one or two statements made above.
1. The reason you get tearing at the screen edges is not trackir - It is the limitations of the system graphics. Those limitations cannot allow the "drawing" of the graphics fast enough to build the picture of what you want to see. So, move the hat switch quick enough on a limited system, you will get tearing. What you can do with trackir, is speed it up or slow it down in order to choose how fast you want to change the view. Like the hat switch, move too fast and tearing might result. But it's no problem - choose the right speed and there won;t be any tearing.Unless you're on an old system.
2. Trackir should not cause any loss of FPS . It never has on my computers.
But you can allow it to. What i mean here is that it depends on how you run things.
When you intend to fly, before starting the sim, you start trackir. A splash scren comes up on the monitor. If you now leave it there and start your sim, there is a chance of loss of FPS. However, if having started trackir you minimize the trackir splash screen, and then start the sim, there should be no loss. In fact, in the settings of trackir, you can programme it always to run minimized. But I do it manually.
A tip on flying it- You may wonder how much to move your head to get a particular amount of movement of trackir? Don't approach it like that. Use your imagination and really think you are in a cockpit. When looking ahead, pick something on the ground to look at ; or pick a direction, e.g 10 oclock , or 3 o'clock. And then, as if you were really in a cockpit, just look at that point or object. You'll find it is so realistic and natural, you won't be worrying about how far your head has moved.
Then gradually make the arc- of- looking,wider - until you can see 5 o'clock and 7 o'clock and even 6 o'clock.
Try all these first attempts in freeflight- (or FSX) - It will soon come naturally and then - ENJOY!