On the device, they have improved the buttons again, which was with the noble model in the glass a bad design. There was a button that you had to constantly press, partly 5 x to turn off, and that was the weak point where the device was actually faulty under 3 years - this same button.
In this model, which seems to be solid again (even if it looks not so noble), is great that it is slow when you press too hard at the beginning to learn to deal with it, and then it happens anyway hardly.
The speed can also be set, which went so far never. I have nevertheless always on the strongest level, but it is sensitive, you go down a bit if necessary.
The charge-glass from the other model also works in this model. So I swear by Sonicare, was me at the time recommended by the dentist and the first model sold directly.