Edit: Sorry, I didn't realize this was in a Hong Kong thread. My experience was in the US. Maybe you'll find it useful, maybe not. I'd delete it but I can't :wink:
I tried it this morning for the first time.
I put my car in front of a parking space in my parking garage. I got out, and followed the instructions (press and hold middle key fob until hazards blink, then press frunk button to tell it to go forward).
It worked. Sort-of. The car started driving into the spot and then inexplicably turned left, leaving it parked diagonally in two spots, like one of those jackasses who just got a new car and doesn't want anyone to ding it.
I backed out, straightened the car out, and tried it again. same result. I ended up parking it manually the way I have every other day.
The most interesting aspect of the experience is this: it's other-worldly to watch your car drive itself with you on the outside. They've still got a ways to go on the self-parking thing though.