James,
Personally this system is of very little benefit to me as a Pilot, the aircraft I fly has GPWS, dual TSO Garmin 530 / KLN 89 GPS, MFD, TAWS and Flight Director for coupled approaches.
Why not have one alarm under the supervision of one (or two) pilots? It's called a TSO 146 GPS with terrain assistance and a map of where you are at what height - RAIM alarm of course being one alarm of note.
Many many if not most IFR aircraft in Australia do not have all the toys.
Not really sure you guys understand the concept of automatic ?, the only time this alarm should go off is if an IFR aircraft is making a GRAVE error in altitude.