It's incredible !!! But this toothbrush has completely changed our grooming behavior. I brush back like teeth ;-) The test winner it has become cope. The battery lasts very long (2 persons, 2-3 times brushing per day, about 1 week). Our "old" 500 series was, however, after 2 days of Platt something that it is no longer worthwhile, they even still unplug.