Compared to WECHAT: 2 stars only! Very very unreliable. Bad phone calls. Outdated design and programming. No up-to-date features! Still its the only way to contact most of my friends in Europe (I live in shanghai). But the experience is extremly slow, unreliable and daunting compared to any other Chinese chat apps. Kinda disappointing but it's the only option. Also why is there is no way to sort contacts to different groups like business, family, close friends ect.