I recently bought, Samsung Galaxy J7. and I must say its a value for money. Very good Front and back camera. No lag observed, I have multiple application running in phone. phone has a very good battery backup. again it depends on user’s usage, but in normal use with 3G enabled, it may go upto 2 days.
I just observed that the ring volume is quite low, which I think could be more and secondly, RAM can be upto 2 GB(but this would have increased the cost). Otherwise it has decent looks and superb screen quality and best product in this price. Just go for it.