I imagine it works a lot better with the second phone key hack - but that's a pretty big risk if you're not just demoing it
On YouTube, TeslaDriver's most recent smart summon video said that Tesla have now prevented that hack in one of the recent software updates so not sure if that's even possible now.
Don't have FSD so can't confirm. Really like the idea of moving the car forward or backwards in a straight line though so would probably purchase if they started to charge separately for the FSD options.