I'm not using TrackIR as I'm not the richest person on the planet... lol What I can say, though, is that I've been using Facetracknoir with a PS3 Eye and am absolutely amazed with the results! I went from being someone who slightly enjoyed CloD but was constantly teetering on the brink of murderous rage about the performance issues etc to falling hopelessly in love with what we have right now, despite it's faults. Yep! It has made THAT much difference! Seriously! (Obviously, I am still waiting for the patch... don't want people thinking tracking turns you into an uncritical fanboy or anything. lol I still have major gripes but the pain is greatly lessened.
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Considering the general opinion seems to be that TrackIR is far superior to Facetracknoir (The price, if nothing else, should hopefully reflect that)..... I would recommend it highly! Once you start using it, there will be no looking back...... well.... technically there will be but you know what I mean.