I turned Face Unlock on when I first got my phone, and I've finally decided to turn it back off. I wasn't doing it for security, but for the "cool" factor, and also because it was actually more convenient when it worked. I've spent a lot of time trying to "train" the feature by using the "Improve Face Unlock" process to recognize my face in different lighting conditions and with/without my glasses on. Despite that, it still doesn't work 90% of the time, and I'm stuck with using the pattern unlock. Since that's the case, I'm going to wait and see if they release any improvements and try again later. Other than that, I'm loving this phone and this new OS! Is anyone else having a good experience with this feature?