I am a pilot, and I say its awesome!

Combining the gyroscope with compass is a brilliant idea. It gives a lot higher degree of precision. It also let you put the compass on top of the map, with the iPhone A-GPS, I just feel like looking at people from the plane. I tested the app from 5000 AGL, and it still renders pretty accurate headings. I highly recommend this app to everyone, this should be the standard Compass for iDevices. (But please, pilots shouldnt solely rely on this app during flight)

Tommy Lu about Gyro Compass