This is the best!
I purchased three.  One each for my daughter, son-in-law, and grandson.  I really like this model because it uses AA batteries and you don't have to worry about a charge.  Just pack it and keep a couple of extra batteries around and you are good to go!  My son-in-law said the first time he used it he felt like he had a professional cleaning from the dentist office!
Rating: 5 stars