I know that I'm behind on mobile technology but believe me! I love! my Samsung phone, the features are so in tune with my needs, whatever I want from the phone, I get, and I love the security feature where It recognizes my face as a way of unlocking the phone. Samsung...you have my heart!
Well, if you ever decide to move on, consider the Moto X, even the 2013 version will change your world. It doesn't have the facial recognition, but Motorola has left Android virtually untouched and the added features that they did provide has become the envy of Android. Once you have Active Display, you really won't know how to live without it. I can easily see myself simply upgrading from Moto X to the next Moto X year after year. I'm trying to hold off on the 2014 until my carrier ships them out with Lollipop. That will give me a little more time with the 2013 Moto X that I have right now.