for me, the return to home function is a crutch. I always make sure a home location is successful before takeoff. There are times when I fly in a wide open area and I get target fixation on the FPV and I lose track of the Phantom's position in the air. I hear it, but can't quite pinpoint it. I flip the switch to return home until I can make it out and then regain control.
I totally forgot about the S2 functions of home lock- It was disabled by default on my new V3 and i never used it on my previous phantom, so i didn't care to enable it. I'll maybe get used to that being my crutch for LOS loss. I have a few other rc helicopters without autopilot systems and i'm interested in seeing how the phantom performs without the aids in place. I'll probably just take off the gimbal altogether just in case.