Actually I dont like any mid range Samsung smartphone Only for its UI. all the mid range smartphones have Touchwise ui and it does lag a lot but my concept change when the tow j series android smartphones becomes popular in market.
In around 15000 this is the best phone I would say because it deserve all the good specs which does not feel any kind of missing or etc. In 15000 it has a Super amoled display that would amaze u.
It has a true octacore processor and very fast 1.5 gigs of ram.16 gigs of internal memory.128 gigs micro sd crd support. A big screen to enlarge your movie experience and much more.
Its my own experience because I hv white variant J7. and I am not facing any kind of negativity and one thing I would say . this phone has two variant .
exynose 7580 variant.
snapdragon 615 variant.
Snapdragon 615 variant is slightly better interms of performance.