This works basically as advertised, almost as fast as Face ID, and good haptics (plus a lock button) on your Watch. If you're on a bus and someone steals your p

This works basically as advertised, almost as fast as Face ID, and good haptics (plus a lock button) on your Watch. If you're on a bus and someone steals your phone, it can be locked immediately using the watch. It does not do a "partial scan" of your eyes and forehead. It just detects a mask and triggers the Apple Watch unlock.