Anybody of the hardcore racers use this device.

Been reading at americas army about it.
http://www.naturalpoint.com/trackir/

There are already a few threads about this:
http://www.lfsforum.net/showthread.php?t=21661
http://www.lfsforum.net/showthread.php?t=14865
http://www.lfsforum.net/showthread.php?t=12020