Just started to use; will update my review over the time.
Generally it reads most English mechanically correct... could be better.
Areas for improvement:
1. with livelier intonation.
2. The currency sign "¥" is not just for Japanese Yen, but also Chinese RMB... you know?
3. UI does not function properly on the flight: it does not switch voice promptly.
4. "Pause" and "Stop" buttons do not work... I have to terminate all browser sessions, not just the webpage it works on.