What I like:
Amoled Screen is vibrant and colourful
Speakers are ok
Decent battery life
No heating
better front camera than xiomi redmi phones
rear camera is also ok
What I dont like:
Every thing about J2 I like. Its a cute phone. BUt I am a huge guy. I need bigger phones with heavy functionalities. so I use on7/ lg g3 stylus. BUt I bought J2 for my father and its so cute and awesome phone!
Conclusion: J2 is an alround winner! Thumbs up samsung!
Tip: I never update any of the phones, Stick to default OS version always. If already updated go to samsung and downgrade for free if in warranty.or for 250 Rs or so!