[d.burnette]

I have to add to the sentiment already expressed on how great Track IR is!
I started with Track IR3, then moved up to Track IR 4 Pro, and just recently ordered the newer Track IR5 - in fact have not even hooked it up yet.
You can use the clip on the headset, or the reflectors on the visor of a ball cap. Myself I prefer the hat clip, as I don't wear a headset.

Get use to it, then in the software you can tweak to your heart's content to get it where you like it, regarding response curves, dead zones, etc. The included profiles are not bad to get started with.

I will also add, it is important - to me at least, to have two Track IR functions assigned to easy to reach buttons on my joystick, these are the Track IR pause key, and the Re-Center key. I use both of these fairly routinely and find having them on buttons on my stick to be very easy to do - becomes almost second nature.
Also please note the default hotkeys for these two functions, can be re-mapped to whatever you like.

Get used to it, tweak it a little, and enjoy! I could not fly without it.