I used asus zenfone max for about 6 months and this is the honest review. come to the phone it is very good looking phone, camera is awesome even in the low light, battery backup is too good it can last up to one or one and half day with max usage, Zen UI is preety managable to customize the app.
There are lot of features like one hand operation, shortcut to torch, blue light filter etc.
The phone is little bit much heavy to handle because of its battery, also too big to grab it in one hand.
At the end I would like to say that it is a good phone with this price range also the brand ASUS you can trust for.