4 stars for me.
Display:
- Screen Measurement 5 => 5.7" is perfect for me
- Brightness: 4 => working OK under sunchine
- Screen Resolution: 4 =>1280x720, will be 5 if HD screen like the 1520
Camera:
- Back: 4.5 => 13 Megapixel (1080p/30fps - 4128x3096)
- Front: 5 => 5 Megapixel very good selfie
Audio Output:
- Speaker: 3 => strong but not a good quality
- Phone: 4 => normal but could be stronger
Battery Life:
- Replaceable: 5 => yes (3000 mAh)
- Life: 4.5 => 2 to 3 days (Talk Time 30 hours - Battery Standby Time 888 hours (37 days)
OS:
- Windows 8.1: 3.5 => some incompatibility (I.e with google), need more apps (soft and hardware), like the tiles
Processor:
- Quadcore: 4.5 => smooth enough for me (Snapdragon 400 4-core 1.2 GHz - ready for Win 10)
Memory & Storage:
- RAM: 4 => 1 GB (good enough for my use)
- Internal 2.5 => only 8 GB (only 4GB left after the system has been install - not possible today to install maps on external sd card)
- External 5 => up to 128 GB on micro sd card
Cellular network:
- Reception: 4 => Use it with Tesco and Three sim card
- Dual Sim: 5 => and on LTE/4G with the option to forward call on the other sim if network let me down
Wifi / Bluetooth / NFC:
- Wifi Speed: 4 => b, G, N but no AC
- Bluetooth: 3.5 => Version 4.0 with A2DP (but not always able to connect perfectly with any devices)
- NFC: 2 => Not like Android, no access to program, just passif NFC
USB:
- Micro USB: 3.5 =>via USB 2 not USB 3 and use to charge the device therfore could be damaged
Finger Print:
- 4 => not too much finger print at all, quite impressive
Calendar / Email / Other Note:
- Calendar 3.5 => not very nice, but multiple account calendar
- Email 3.5 => not very nice, but multiple account (not always OK with Google account)
- Note 4.5 => Excellent with one note fully synchronise with laptop / destop / WEB, including also voice/picture/video recording
Other :
- 4 => with data sense, VPN, hotspot, lockscreen, backup, Quiet hours, driving mode, Here map +, Cortana, Word flow keyboard, Glance screen, motion data