I m using Samsung galaxy J7(2015) model. it is a good mobile.when compare with other my using phone. it’s given me good performance. I m also using some other companies phone.i have lost of problem like battery, sound, camera, weight of mobile etc. but when I compare to Samsung mobile is better then the others, his camera quality both front and back is good, Sound quality is good then others, Ram and processor speed is good, Internal memory 16 GB is sufficient for anyone.My overall opinion of Samsung Galaxy J7 is better then other on same rate of mobile. Samsung is a good brand.