Great
Advantages: Specifications matching described. Relatively fast octa-core CPU, 2GB RAM (above 1GB free by default), good camera, fast 4G (got over 12Mbps) and WiFi (over 50Mbps in tests). Nice HD 1080p screen. Good camera with ability to make 3D photos (that really works after some practice). 16Gb ROM where 10Gb are free. Speaker and mic are not bad. Long standby time and average worktime. Very lightweight for its size. Got 32k points in antutu benchmark. Can be used in VR headset (has all required sensors).
Limitations: Android 4.4. But it has built-in firewall and security manager, so it isn't a real problem. Bluetooth is very low-power, when distance is more than 2-5 meters the handsfree connection drops randomly. Fast GPS start, but seems to be low accuracy.