Compared to the previous Galaxy S III, you will find features from the Note II and additional enhancements in the Galaxy S4. My experience with these include:
Smart scroll: Designed to scroll through select apps using recognition of the tilting of your head or tilting the device. Despite the rumors of eye tracking, it doesn't appear that this is how movement is controlled. It is a slick feature to show people, and seems amazing at first glance, however beyond the "wow" factor, I don't see people using this for more than a week.
Smart Scroll works with the web browser, I found that with my glasses on, a more pronounced head tilt was required, and it seems that the facial recognition aspect isn't as sensitive with glasses on. It was annoying to tilt my head up and down to stop and continue scrolling, and I found no benefit to using this method compared to simply swiping up with your finger.
Smart PauseThis feature is designed to pause video when you look away. However, I tend to watch movies and videos when I am in not-well lit environments, and Smart Pause doesn't appear to work at all unless you are in a bright location where the front facing camera can clearly "see" you. Again, it is much easier for me to just tap the display, and I don't look away on a regular basis when watching videos on my phone.
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