I had a hell of a time getting used to my TrackIR, in the beginning I battled constant nausea and vertigo. During the first frame of the recent scenario, I had such a bad bout of vertigo that I closed my eyes until it went away. Not something I'd recommend in a scenario! I think I've gotten to the point that switching back to hat switches would make things worse and I'm starting to have an easier time. If you use taters, the device makes shooting MUCH easier as you can more smoothly track the target.
Here are my rules for a good TrackIR experience;
1. Don't even bother using anyone's profile, unless you want to use it as a starting point.
2. If you're a very old hat user, I'd recommend a more aggressive profile so the delay in looking around is similar. However, read rule #1.
3. I found shooting with a gunsight that moved was very frustrating, so I put in a deadband in the center. Nothing is worse or more uncomfortable than having to keep your head perfectly still. However, read rule #1.
4. Disable roll axis and make the x axis (lean side to side) very aggressive to look around canopy bars and armor plate. However, read rule #1.
5. Set a joystick button in Aces High to re-center this device. This is a must, regardless of rule #1.