Also we have unfortunately suffered many disappointments with this toothbrush: it was replaced after approximately 8 months twice, because the engine was defective (in normal use by two people). The third time, the toothbrush was not replaced and it was not against us, which was almost 1 year after the last exchange. Even my dentist has confirmed that with him privately (his family with three children also used this toothbrush) also constantly in nearly the same rhythm the toothbrushes kaputtgehen- but, and this is the real Unverschämtheit- you always treated accommodating him very much, because you yes knows that he is a dentist. Well, you can not say we mere mortals. We were treated without any goodwill, they recommended, nachzukaufen a single handset at full price. Sad, actually would be a very good toothbrush, but that is not to finance, more than 200 a year just for toothbrushes ...