1. Quality of brushing?
The noise is more serious on this high-tech model, I feel I have more effective vibration (stronger) that do not irritate the gums, however. The feeling after brushing is identical (although smooth teeth).
2. Ergonomics
Almost identical to the level of grip. I especially like the timer. It's silly to say, but when you are tired, head elsewhere (if one thinks become president while brushing teeth, not shaving, for example) have a timer that tells you how long we brush them teeth (ie 4 areas are well defined) is very useful. After the time has elapsed for an area, the brush stops half a second and the timer indicates which zone pass.
Conversely I am more than skeptical about the pressure indicator. So that it fires and indicates too much pressure, it must go! Now I tend dixit my dentist just to press too hard when I brush my teeth. The function I was interested but I'm not convinced (calibration problem on my copy? I doubt it)
3. Equipment provided
It is complete (number of brushes with different functionalities) plus a hard carrying case useful. In short nothing wrong.
In short, an efficient and quality tool, complete. While a bit pricey, but do you know that there is a correlation between life expectancy and quality of teeth? So why not take care of his teeth ^ _-
