I have been using it since last 6 months. Good camera quality but poor functioning of the overall device. Display is not that much good. It hangs for a time.
The mobile phone is not upto the price. Oppo is just indulging in maximizing the price of phones and using that money in advertising their devices. And hence not providing the quality phone as per the high prices.
Sound quality is good. Builted nicely. Design and style is upto the good.
So overall phone is good but not value for money. Other brands offers better quality in less price than this. Therefore it would be good to go for other brands than oppo or Oppo A57