What I plan to do is find a quiet car park and play around with the perpendicular parking option, just to get used to the messages and doing the actual driving bit. Once that is sorted, then it's time to try the parallel parking option but it's no so easy to find somewhere quiet to practice that.
I used it a handfull of time. Works like a charm.
My wife uses the car more often than me, and altough she is not a parking ace, she finds the use of the system harder than doing it manually! (go figure)
So, for the time being, is more of a gimmick rather than a system we rely on.