I purchased Samsung Galaxy J7(2015) from Flipkart around 10 months ago and till now I have found nothing to complain about. Its details are as follow:
1- You will love its 5.5 inch Super amoled display. Its main attraction of phone and is unbelievable at its price.
2-13 megapixel back camera and 5 megapixel front camera do their job perfectly and give good quality pictures.
3-16 GB internal and expendable upto 128 GB provides ample of storage space.
4-Smooth and simple interface of android 5.1 Lollipop with Touchwiz of samsung makes this phone lag free.
5- Octacore processor and 1.5 Gb of RAM is enough for day to day usage and gaming.
6- Massive 3000 mah battery provides this phone 2-3 days of impressive battery life on moderate usage and 8 hours on on screen time.
Some minor cons are absence of light sensor and magnetic sensor but these are definitely not deal breakers.