I have been using asus zenfone 3s max for 4 months.Phone lags a lot and eventhough the battery is 4000mah it drains very ( after the latest update) .The camera quality is also poor. It heats alot which is very disturbing and the processor is of poor quality.
But the cost of the phone is affordable. Overall for this price range you also have many better options than asus.The phone may be OK for some but not for me?