Just spent an hour or so with my TIR and, compared to FT with a 30fps web cam, TIR has a faster response time. Never thought about it before or the possible impact on game play. I don't know much about the PS3 eyecam other than it is compatible - wether to get one depends on COD's headtracking API support but, from what I understand, they are reasonably priced so worth getting for my second PC set up and have FT on one and TIR on other.
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