One interesting thing no one has mentioned on this thread is the built-in barometer/pressure-sensor in the iPhone6. It raises some interesting possibilities for IGC logging and possibly some kind of certification by the IGC for badges/contests/records.

Air avionics and the iGlide software have a jump on the market when it comes to this particular feature.

Dedicated hardware still has some advantages; but the gap is narrowing every 6-9 months.

--Noel