The app functions on YouTube only, so you will only be able to use LookAway Player's features on YouTube videos. In my testing it worked pretty much as advertised. Simply play a YouTube video, and when you turn your head to look away, facial-recognition software automatically pauses the video. When you turn back toward your iPhone, the video starts up again. It also worked when I looked down, but had trouble when I was looking upward. When I just turned my head away from my iPhone, the feature worked pretty well. You have an option in the settings to turn off what the app calls Vision Control, but if you're going to turn off the main feature, you might as well use a more feature-rich YouTube client.
LookAway Player has a feature for quickly muting a video as well, but it's not as reliable. When you want to mute a video, you can raise your finger to your lips in the classic "Shhh!" gesture. Doing it again turns off the muting. I was able to get it to work on some occasions, but I found the muting to be much spottier than the look-away feature. I even found that the video would mute on several occasions when I didn't use the gesture at all. There are sensitivity sliders in the settings for both the look-away feature and the muting, but no matter how I adjusted it, the muting simply didn't work reliably.
As a YouTube client, LookAway Player only provides a couple of ways to browse videos. You have a button for looking at videos currently trending on YouTube and a search button where you can enter a keyword to search. You don't get the latest videos submitted, most popular, or any of the other categories you are used to on YouTube.
Overall, LookAway Player does its job and its Vision Control main feature is fairly reliable. But the unreliable muting controls along with its very basic YouTube browsing options make it more of a gimmick to bring a Smart Pause-like feature to iPhones before the release of the Galaxy S4. Still, there's no reason not to check out a free app that works pretty well for its stated purpose.