A couple of things the Area 500 lacks:
1. The ability to display present position from a defined waypoint (e.g. home aerodrome) rather than from some system selected 'nearest' waypoint. That can be very useful when flying GH and needing to keep a quick 'brg/dist from home' awareness - if the unit changes the reference waypoint without being asked to, it can be quite misleading. Or am I wrong?
2. An automotive GPS for all that money which doesn't have TMC traffic information? Madness.