Mine works about 90% of the time. If I wear a hat or the sun is really bright from one side is almost never works.
If you want to use it you may have to "train" your device in different settings. Do this:
Settings, Security, Improve face matching
I did this about 5 times in different settings and it helped improve things.
Good luck!
I liked it for a bit. I updated the picture about 3 to 5 times a day for a week with different lighting, angles, facial hair, etc. After a week I found it to only work 80% of the time (don't get me wrong. Best facial recognition ive used) so I switched to a swipe patter that will be reliable 100% of the time. I didn't like the delay it would cause when trying to get into phone and the app drained batter and used extra ram.
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Sent from my Galaxy Nexus
I don't like it, my phone unlocks when my brother tries it. I dont think we look that similar for it to be unlocked by his face
I never trained mine, so I see that is my mistake. Still the whole picture thing kind of defeats the purpose of the face lock. When I'm home I turn the security to none and when I'm out I'm using pin simply because it is the fastest. I like the pattern, but after a while - you can see the pattern on the screen protector.
On Christmas I was visiting family and went to show of the face unlock. My brother who is about 3 years younger tried it 3 times and it unlocked just the first time.
Sent from my Galaxy Nexus using Tapatalk