First of all I'll give a description on the specs.
CAMERA-Primary23 MP, f/2.0, laser/phase detection autofocus, OIS ( 4-axis) , dual-LED ( dual tone) flashFeatures1/2.6 sensor size, 1 µm pixel size, geo-tagging, touch focus, face detection, HDR, panoramaVideo1080p@30fps Secondary8 MP, f/2.0, 1080p
BATTERY -Non-removable Li-Ion 4600 mAh battery Talk timeUp to 34 h ( 3G)
MEMORY-Card slotmicroSD, up to 256 GB ( uses SIM 2 slot) Internal32/64/128 GB, 3/4 GB RAM
PLATFORM-OSAndroid OS, v6.0.1 ( Marshmallow) ChipsetQualcomm MSM8976 Snapdragon 652 CPUOcta-core ( 4x1.8 GHz Cortex-A72 & 4x1.4 GHz Cortex-A53) GPUAdreno 510
All the features are good. But zenfone ultra pricing is too high thats why asus looses lots of fans.
Screen is too big for smartphone. But gives a beautiful stunning display. Watching movies and playing games on this size screen gives a good experience.
There is no lag, multiprocessing is too fast, cpu is to powerful. It doesn't heatup that much.
23mp camera provides stunning clarity , great color saturation, and the pixel master makes its awesome .
The staRobotouchzation for 720p mode is great but it also good at 1080p.
Asus ZenUI gives you a wider range of coustomization. Whatever you want for the interface is inbuilt in Asus.
Coutomer response is good. Thats all. Thank you