The idea of the GameTrak
is to provide a very intuitive and meaningful interface for games that simulate physical activities - specifically that deal with hand motions. These include games such as baseball, where you swing a bat, boxing where your hands are the most important aspect of the game, and golf, which the game that came with my GameTrak
controller, Real World Golf
I found that the GameTrak System allowed Real World Golf to quickly and fairly accurately represent my positioning on the screen - once it was properly calibrated. The club rotation was not as accurate, but could probably have been improved if the game had additional calibration specifically for tilting the club.
One thing that should be fully possible with the GameTrak but wasn't implemented in the game is the calculation of the actual distance that a ball would travel, given the specific swing that the player performs. The game uses "power" percentages and applies that to the abilities of the golfer you're playing as, rather than calculating your personal ability based on the swing.
The GameTrak Game System does not emulate a standard controller in any way, and as such, may only be used with games that support it explicitly. However, if you're into a game that specifically supports the GameTrak, you will find that the GameTrak not only lets you, "Play In The Game" as their tag-line decrees, but also can give you a pretty decent workout - which is always a plus for a game controller.