I think brumster and all involved with EDTracker deserve a huge amount of kudos for getting the thing to where it is, and offering gamers a great cheap solution to head tracking.
IMO the more people use head tracking, in whatever form (including OR albeit a different kind of gaming interface) the better. For certain games the difference between using it, and not, is huge.
Tip - try using it on racing games that support head tracking also, and use the in cockpit view. Bloomin brilliant!
Taken enough time for it to really take off (excuse the pun), for so long developers ignored it completely, mostly due to the console dominance on the market, but glad it is getting a new lease of life recently.
And for those who worry about ye olde myth (looking too far away from the monitor), imagine your looking at someone straight on, and shake your head a small amount while keeping eye contact....its that easy!
Again, well done brumster and the EDTracker team!