This toothbrush is excellent and works wonderfully, however the batteries cannot be replaced and the unit will end up in a landfill after several years of use. Performance/Cleaning Sonicare toothbrushes do a great job at keeping your teeth clean and are well designed. This toothbrush has made a great difference in my dental hygiene over the past few years, and it is fun to use. Durability Philips sells replacement heads for these toothbrushes, but there is no way to change the battery other than opening the toothbrush with a utility knife or some other tool. I am currently using my second base unit/handle for this Sonicare because of dead batteries that I was unable to replace. This "planned obsolescence" is unacceptable because it is overly expensive to consumers and harmful to the environment. I hope that Philips makes an easy way to replace the batteries for their Sonicare series in the future.