I bought up this device on 25th Dec 2015. and used it now more than a year.
Pros:
device has best display I have ever experienced( I know people would start to say the new devices in comparison, Remember I have brought this on 25th DEC 2015 and on that date this was the best in display).
Sound reception is on an average way not to consider that a a plus point coz I do remember Nokia series had bit better sound clarity compared to this.
Ease of use is OK but on a screen of 5.1 we need sometimes a 2 hand operation.(there is also split screen which is most beneficial)
Range and features: the range reception is above average and suffices the requirements at its best.
Reliability: the device is having a metal case on surronding which makes it bit hard to get damaged physically, and the OS as well as internal hardware never had issues with performance and accuracy.
6: Value for money: I did get the best exchange deal from S4 to S6 with a wireless charging pad as an add on.
Cons:
The rear camera is bit protrudes outside and I did not like it personally.
The screen is too glossy and fingerprints do remain on(i have the same issue at the back of device as well).
Battery is not replacable.
2550 mah battery is not sufficient needs a better and bigger battery( I agree there is a ultra power saving which extends the battery but with not all features being active).