The j series one j5 and j7 were launched consicutively and both did a very good job as they included most of the latest new features which was not in others phone like ultra power saving mode and ultra data saving mode etc.this both phones have a crisp display with a good ppi and as samsung used in this a costly screen or touch pad on it which make it more beautiful by its great viewing angles .
Disadvantages. that were it was having very and very common sensors accelorometer and proximity no gyroscope and others sensors so it was very bad and it was not as fast as it coupled 1.5 gb ram and had a snapdragon not very old but show what not up to mark processor so as becausce of this if you want a phone from good company amd with a high definition screen you can go for it but in my opinion if you are sort of gamer than I dont recommend it .so thats all friend