Probably best toothbrush on the market vs. miserable life

I have this set now for the third time. Why?
In my environment, I have several dental hygienist and dentist. They are all convinced of the toothbrush. I have tested various systems (rotating) and find the sonic toothbrushes for me personally the best. If you have cleaned manually for years, it is to brush like a revelation with sound: the teeth are again much cleaner, tartar just walks away, where one hand does not reach much.

BUT: the first set has held for 25 months, then both handpieces went broke within a few days. So buy new. Then both held handpieces by 18 months. This time warranty and replacement. The new handpieces have again endured 18 months. Unfortunately, now is no longer the warranty.

I think along with spending on the heads of the investment is simply too expensive. The product life is just too short, in relation to the price. That's just not right!