If you are looking for a branded phone in mid range budget then samsung galaxy J7 is the best choice. I used this phone form last 5 months. there is no any major problem with it. I am not going to tell you any technical specification of the phone as you can go to any mobile site for this.
Design: When it comes in my hand first time I noticed the phone is very sleek. there are no any sharp edges. the look is not so attractive. there is no any major modification in design by samsung. The phone provides a great grip in hands. I will give it 3.5/5 in design sector.
Display: There is no any compitetor of samsung in the field of Display. 5.5" AMOLED display is very awesome. The colour production are very good. The sharpness is so sufficient that you may not feel any problem while using it in day light. The touch is very smooth and responsive. I really become a fan of its display. I will give it to 5/5 in display sector.
Performance: In this phone there are only 1.5 GB of ram is provided. It do not create any problem in present but I thing it may become a cause to purchase a new phone after few years(2-2.5 years) in future. because the androids apps are grown up in size day by day so I think 1.5 GB ram do not stand with you for a long period. But In present there is no problem. I do not feel any problem in multitasking, do not feel any lag. I will give it to 4.5/5 in performance.
Camera: The front and rear camera(5Mp & 13 Mp) both are awesome. The rear camera captures a very good and sharp pics in day light but in night the pics become little noisy. The rear camera flash work very well in low light in rooms. The good thing is IT has front camera flash. the pics of front camera are also very sharp. Flash helps you to take good selfies in night or low light. Overall this is also a plus point of Samsung galaxy J7. I am really happy with its camera. I will give it to 5/5 in camera segment.
Battery: The battery lasts for one day for normal user. and 16-18 hours for heavy users. in battery segment 3.5/5.
Sound: The a not so loud but sufficient to perfprm in outdoors.sound also lacks sweetness. in this segment 3/5.