Disadvantage is that the devices too loud in my case both to really feel at ease, because who wants to have a morning overly obtrusive buzzing in the bathroom? Who is sensitive should look for another model. Compared with the high-end appliances from Braun will continue to fall on two things; on the one hand is consistently omitted frills and the 650 comes with no radio or app from, but you have, for example, to the pressure sensor dispense (for excessive pressing while cleaning), on the other hand, the brush is felt slightly slower than the top models (dressing but just as well).
For all beginners or as a compact travel toothbrush is a good choice, if you want really brushing electrically but should look for one of the more expensive devices because here you really get only the bare minimum of the toothbrush. Purists can safely start a trial but actually, according to advertising can be exchanged if not satisfied yet, the device 30d, as is regulated here on Amazon, I had never been tested.
