Let me set the stage... I brush my teeth at least twice a day and typically three times. I find flossing tedious and most days I don't bother. My dentist suggested this type of brush as part of helping to address some gum irritation. This thing is great. Tooth brushing no longer feels like and awkward messy chore. It is quick, clean and I can feel the difference - teeth have that slick, just left the dentist feel. I like the pressure sensor that notifies me if I am pressing harder than I should.
I was worried about travel and having it run out or needing to make sure it was always in the charger. Not a concern. I cheated it overnight when it arrived. I have purposely not charged it again since then. A week later, it is still going strong without a charge.