Of course, the head is changeable, I might opt for a more efficient brush, especially when it comes to clean between teeth. But the size and weight of the device discourage me, especially when I see the price that must be put at the end without the certainty of a good result.
Well we still recognize some qualities in finishes of the unit, including the charging cradle devoid of any metallic connector as the device charges by induction. Logical as it is supposed to be placed next to your sink.
The rest is a purchase to avoid.