Unit is very quiet
I've tried several different styles of water flossers and all failed within one year because of water intrusion into the motor and battery.  This unit does not use a hard connection from the charger so there should be no way for water to work its way in.  The unit is very quiet and holds just the right amount of water for a good flossing.  One negative is it is not as powerful as some of the other units I've tried.  Time will tell if this one holds up.
Rating: 4 stars