http://www.techradar.com/news/watch-iphone-x-face-id-get-stage-fright-at-its-apple-event-debut

Just how reliable will Face ID be, the new facial recognition system built into Apple's new iPhone X handset? It may need a bit of fine tuning, if its debut at today's big Apple event is anything to go by.

Being demoed onstage by Craig Federighi, Apple's senior vice president of Software Engineering, Face ID seemed to have trouble recognising the executive in order to unlock the iPhone X.