Had tried tracking two flights, the response is average and so is the information.
The board at the airport was reading different time and the application a different time. All must be careful as this is not 100% reliable. For an app which is 5$s, there must be perfectness.
Also the push updates are not perfect, the flight was 2.5 hours late and it have an update that the flight left on time from Heathrow.
Improvements must be initiated.
Shitij Malik about FlightTrack 5, v5.0.1