Regarding difficulties in setting up Track IR, I use 4 and never had a moment's trouble with it. Installed the software, put the emitter on top of the monitor, the clip on my headphones, pressed the key to centre it, and never had to adjust it once. IL2, FS9 and FSX; all perfect from the word go.
The only related problem I had was the fact that I wear varifocal specs and had to buy a cheap pair of single vision ones, about £9 off the shelf in Tesco.