I think opportunity should develop new GUI which can easily understand. Battery performance of oppo is Good. I like Camera because it give bright picture in night but other performance is not good as compare to price. Speed of Smartphone is best but it drains battery too much. I get only 3 hours of battery backup without internet uses. Display is too much bright. Colours of it are I think harm for eyes . White colour of oppo is too much sharp it can directly go in eyes.
I usually like but problem is GuI and Battery backup . Design of it is best like I iphone.
Before you buy you must consider these.