Otherwise, a great device that teeth really and clearly cares more visible than it can even so thorough cleaning with a manual toothbrush.
Functionality is very good, operation is very simple. The battery life could be a little better - if 3 people 2 times a day brush your teeth, I can leave the handset virtually on the connected charger ;-)
Otherwise highly recommended.
As mentioned above, I can not say anything about the functionality of the app, as over Bluetooth (still) can not be communicated properly. But for that I will certainly find a solution :-)