Feature wise on paper, the phone seems good. But what really count is User Experience. So I am reviewing it not just by the features but also by including User Experience.
Pros
1)Battery Backup(4.5/5). The battery is really huge and I was able to use it more than a day and a half without charging. The power saver modes are excellent and helps to conserve power by adjusting performance and disconnecting cellular network according to preferences.
2) Display. The 5.5 inch display is 720p.The display is good but Its not very sharp and has average PPI. But on brighter side, this saves a lot of GPU processing and thus conserve power. It also has in-build reading mode, which is really excellent. Using kindle app for reading book was a very good experience, and the difference between 720p and 1080p never affected readability.(4/5)
3) Call quality. Call quality was good. I never felt that I am using a low end device.(4/5)
4)Speakers and Headphone output: As expected the sound was mediocre but Headphone output was good.(3.5/5)
5)GPS/Navigations/ Compass and other sensors: all were working fine and were quite responsive and precise.(4.5/5)
6)Physical Look and usability:
a)I didnt liked the placement of Volume rocker buttons on backside. That was totally not comfortable and the phone looks awkward because of that.
b)The power button was on top. Which was again not a great design but it was tolerable.
c)The capacitive buttons were there but there was no backlit for them. Because of this, using phone in night was a bit difficult. Also In such a big display there is no need for capacitive buttons and could be replaced by software buttons as done in Xperia Series. This could have reduced the size of phone too.
d)Notification LED is very basic and produces only red and green light.
e)The customised software is good and lag free. A lot of useful utilities are preinstalled.
(2/5) for poor design.(the physical appearance is first impression and this phone fails to set a good first impression)
7) Camera: Camera is totally useless. Whatever the lighting conditions are, the images are always noisy. On zooming it breaks significantly. The images are never sharp and clear. It would have wiser for manufacturers to work on camera rather to include Laser autofocus feature. But surprisingly the front camera is good and performs better than expected. Images were sharp and clear from front camera.
(2/5) Very poor rear camera.
8) Connectivity: It boasts 3G and 4G. But I tried this phone with BSNL, Reliance and Airtel. It failed to connect to internet over 3G network. I didt tried 4G. But 3G definitely failed. Sometimes when I switched to 3G it went out of network. Many times though it was showing full network strength but It kept my phone out of network. In all cases I was not able to use Internet over 3G network. I dont know it was just me or its with all other phone, but due to this problem I RETURNED THE PHONE TO FLIPKART.
(1/5)
Conclusion: If you want a phone that looks good and has good camera this phone is not for you.
If you dont care about looks and If you need a reading device with a good battery backup and you dont care about connectivity issues over 3G you can go with this phone.
(The overall rating is minimum rating obtained for each parameter)