I have used Samsung Galaxy J2 for more than 6 months and here is my experience with it.
It is comfortable in size and display is good but not very good. Signal reception and call sound quality is good but speaker is not loud. It’s battery is not good if you like to watch movies. It cannot play high end games and if you try, you will not want to play that game again. After few months of use this phones also hangs alot even when you are not using to play games. Its camera performance is not good too.
My experience was very bad with this phone.
I would recommend Xiaomi Redmi 3 to buy alternate to this mobile.