My friend just purchase a oppo set when I look and read all feature I feel that why I am not purchase this mobile set. this Oppo f1s model battery backup great and ram is also 3 gb great. because of ram its application running too fast processor going also fast. sound quality very clear . one thing is its ease of use. style and design is not different from other mobiles style r not a excited look but ok. its durable and value for money. according to rate of this set not a bad deal . now I think about to purchase this set also.