Finally, today I got the balls to switch on my fail-safe whilst in GPS mode. It did just what the thing was supposed to do, climbed to 60' or there about, waited a few seconds and headed back to its home position. Hovered for about 15 seconds and landed.... Scared the crap out of me but when you see it doing its thing and you're wondering if it will fly off, fly into a tree, shoot straight up in the air... it gets kinda scary.
I have a fail-safe switch next to my mode switch, just in case things get hairy, I can move it out of fail-safe and disengage RTH. Did not have to use it, so the panic is over.