I have been using my Sony xperia m4 aqua dual for last one month, the phone design and quality of plastic used in phone in exceptionally good, mobile is facing no lag in performance till date, camera is good good can't say best in this price range, but phone has serious heating issue just because of snapdragon 615 processor, otherwise there is no such problem, battery gives a whole long day backup, it runs on android lollipop hoping for marshmallow update rolling out soon, and its come with the tag of well know brand SONY.
