After 3 months of use there is a mixed picture, which is why the 3 star:
- Cookoo sucked the iPhone battery at the beginning, as already described, within a few hours or less empty. Is significant gotten better.
- With each app update coming more and more of the promised features that are almost but not activated for laymen or only indirectly (eg Google Voice USA number for SMS and email notifications!) Are available.
My Conclusion:
Normal users should still leave it alone, for 'Beta' users who like rumfriggeln sometimes, a nice field of experimentation.
More details can be found on miApple.me.