As of my personal experience, I have used 3 model of samsung brand till now. In beganing they are quite good . as they are more durable for us middleclass family belonger but now these loosing quality. Got hanged, touch problem.
To be honest, I love samsung mobiles outer look more than a ios apple or other blackberry brand mobiles. you must have to focus on inner quality of these mobiles dear samsung . coming to the reviews of samsung galaxy J7 prime - its a good mobile at all but it get slow instead of its 3gb ram.
Thankyou