Sorry for the slight necro but missed this thread somehow. I have Facetrack/PS3cam/DelanClip on my travelling PC and TrackIR4+TrackClip Pro on my home PC. I much prefer the TIR to PS3cam where the Y rotation (nodding your head up and down) basically doesn't happen as the IR 'blobs' overlap too easily meaning the software cannot work out your head position anymore. Need a much stronger filter.
Using TIR camera basically means using the TIR Software, which looks nicer but doesn't really work any better than FacetrackNoIr.
I have dropped my headphones many a time, and each time my TrackClip falls apart, but it hasn't broken YET. Putting it back together inevitably means stretching the plastic lugs and the VERY thin little wires, so breakage is only a matter of time, but as I've had this kit since the Arma1 days, I can't really complain.
My ideal setup would be the TrackIr with the DelanClip instead of the TrackClip. Not much of a cost saving anymore not that the TrackClip has come down in price a lot, but much sturdier.