The build quality of this electric brush (2-year warranty + 1 year by registering with the manufacturer) is very good, almost as much as high-end models too expensive (like 7000 Black that I know well.) She is of course completely waterproof and can be recharged by induction on its base (the latter, a little too small and especially very light, lack of stability.) The battery is a NiMH, fairly average range (less than 30 minutes.)
In use, there is unfortunately no exception to this rather unpleasant operating noise, whirring (we do better elsewhere) and potentially embarrassing for others in the morning. One standard mode is proposed. The efficiency of this brush is indisputable with Floss Action brush provided. The subdivision of brushing 4x30 seconds (tactile signal) is always nice (even if all the manufacturers do now), as well as the pressure sensor avoiding too strong a support (which prematurely wears the brushes, without increasing effectiveness of brushing, quite the contrary.) The system is respectful of the gums. Easy cleaning.
In the end, good device that plays the simplicity card, and minor defects. Too bad only one brush is provided. Good news, those parts are quite cheap compared to other brands in exaggerated price.