I have been used asus zenfone 3s max over 4 months and I come to know that this phone is not up to the mark.
The function of this phone is slow. If you talk from this phone over 30 min, this get heated badly.camera is also not good.photos are seems to be bad quality.
But some feature of this is good.like its asus motion geasture, do not disturb mode, multiscreen window, shortcut key given for screenshot, etc.
Overall this phone is not good but also not bad. Some people can also refer to buy this phone, if they have short range to buy the phones.