Summary - This is an excellent phone from Samsung which does all jobs very nicely, feels premium in hand and provides excellent battery backup. It might be 2-3k more expensive than other phones from Lenovo etc however it deserves that premium.
PROS:
1) Excellent AMOLED 5.5 inch screen - Almost at par with iphone screen, certainly better than screens you get on other Android phones.
2) Excellent battery - Will last for 1.5 days for medium users, almost 2 days for light users.
3) 4G connectivity - I am getting very good speeds on Airtel 4G. The 2nd sim switches to 2G when using 4G on the first sim. This I guess happens in all phones.
4) Weight Distribution is excellent. Though the phone is 5.5 inches and 180g it feels very light in the hand.
5) Call quality and clarity is good. Loudness is adequate.
6) Build quality is decent for a plastic phone. Feels premium.
7) Removable battery - No need to visit service centers for battery replacement when needed.
8) Lot of accessories like back covers and cases are available in the market and online too which helps you customize the look of you phone