Design ia flawed
Fluid leaks into the battery necessitating very frequent cleaning. Sonicare has been getting progressively worse. This is probably related to ownership by Phillips. My first one (original Sonicare) lasted 8 years, second one 2 years. I don't think this one will last the year.  My advice, check out the higher end models and see if they have a better design.
Rating: 2 stars