Samsung advertised this smart phone as a companion for you. Indeed, it is TRUE companion. I am using this since 2013. I used for 2.5 years, then sold it as I wanted to try new smart phone as market was evolving, and I purchased MI4. Though it was awesome and fastest phone at that time before 4-5 months, but still as I was missing my S4, I sold MI4 again and bought S4 once again.
So till this day, I am using S4 only, my true companion.:-) And also, there are MAXIMUM sensors available compared to any other brand.