Did you get the clip thing or did you just go with the reflectors? I ended up getting the TrackIR with the clip with the 3 LEDs built in. But recently the movement was real jerky, especially when I looked left. I figured out eventually that the LEDs weren't aimed at the IR camera very well. The IR camera is on top of my flat panel and is about 10 inches higher up than the Track IR clip, so I figured out that I had to aim the LEDs upwards on an angle towards the IR cam as much as possible.
After that movements were much smoother. I'm pretty new at this game and I've never been a pilot IRL or even in a realistic flight sim, but the Track IR is great, its totally natural to look around or move my head side to side to see around the metal in those crazy russian cockpits when it obscures my target.
Also follow the quickstart instructions closely or else you'll miss a little detail and wonder why nothing works hehe.