I've just got this os today and I'm satisfied with it but not at all. I'm satisfied is a battery last longer without an open data and the os running smoothly. What's I'm not satisfied is music quality sound. The quality sound isn't best for me because I most like the quality of flyme 5.1.7.0y sound that's not use an equalizer with using an ep-21 earphone with meizu m2 mini . That's all. Thank you. Hope meizu can solve this.