Hi , I have been using this device since 2 years and this has been an excellent device for me as this device comes with 1GHz octa-core processor and with 2 GB of ram with which this phone do not lag and if you are intrested in watching movies this phone is the best as the picture quality is very good( 1080x1920 pixels) with amoled display and the soung quality is pritty loud and its full metal body enriches the phone . Its very good that samsung keeps of updating this version and the camera is also good in comparision with many devices . Yes there are few back log of this device this because of its full metal body the battery is nonremovable and this device either supports 1SD card and 1 sim card or 2 sim cards and another weakness for this device is it get heats up quickly .