This phone is very nice I am using it till from a long time and this is also write by my Vivo V5. According to my personal use this phone does not lag or hang till now. This depend on your usage how you take care of your things.
The selfie of this phone is amazing. Although it's told in the ads camera and music. And it's right the music quality is also nice.
Whether it's night or day the front facing camera adjust automatically according to the surrounding. So, anyone is selfie addicted this is your phone.