My wife have been using the phone since last 12 Months and to my suprise the phone do not lag I repeat no laging since earlier phones from samsung always gets hung.The built quality is very good, slim body and the screen is very good of 5.5 inch bright display.Battery backup is good, even in 4G usage.Good usage of ram and processor.Camera quality is good which is capable of taking good quality pictures in daylight, but lacks low light photography.Phone is total value for money and looks and feels great.