Guys I am using samsung galaxy j7 2015 from november 2015.So I will tell you pros and cons about this device.
PROS.
1.Phone is very slim and looks great in hand.
2.3000 mah battery gives a day long backup even on heavy usage.
3.Front flash is a plus point for this becuase you will not get front flash even in S7.
4.cellular call quality is good, you will not face any problem in this area.
CONS.
1.Front camera is not upto the mark specially I n night.
2.1.5 GB RAM is good but not excellent, you will face lagging after a year use due to software updates.
CONCLUSION.
You can go for this device if you are samsung lover and a moderate user.