I have been using the p55 max for last 8 months and I am full experienced with it so. First of all I want to say that the sound quality of this phone is like an average quality phone which is not good for the budget type phone. It has a stock Android os based on 7.0 android naougat and has very stock type experience on operating it.it has a metal back body with scratched back design and has a slim body. Only one thing in this phone I liked much was its battery backup which is of 5000mah which lasts upto 2 days without rough use but goes on for hardly one day with high rough use. It feels nice on hand because of 2.5d curve glass but in the time of security it fails because no 2.5d curved tempered glass is madded.