I bought this phone 6 months before still no problem.
Asus phone is having snapdrogan provessor hence it works fluently also it has 2 gb ram hence all the apps runs efficiently.
Asus zenfone is having 13 megapixal rear camera and 5 megapixel front facing camera, asus is having very good camera quality.
Fisplay of asus is also of a great quality I m using it from last 6 months very roughly but still no problem and display size is quite good that is 5 inc display
I suggest buying this asus zenfone of great quality in a budget