I have tested the TBS RaceTracker and made a comparision of the video timing and the Tracker Timing.
The Tracker works well for me, but it always depends on how much precision you actually need and expect.
Disclaimer:
Don´t look at my flying skills, they are definitely poor :-)
But maybe you can tell me why i have this strange sudden extreme roll in the turn although i only gave a little more roll input. You can see at 2:04 and 2:54.