I just purchased one of these and have only used it a few times, so keep that in mind. I am comparing it with the Water Pik Cordless. First, I am disappointed that it seems to have a very small tank. It says it is the same size as Water Pik, but only lasts about 30 seconds and has to be refilled several times. With the Water Pik I would have to refill it maybe once. Also, it comes with only one tip, but I don't know how durable it is. One thing I am not happy about is that instructions state you can't use anything but plain tap water. My dentist said to mix it up with part hydrogen peroxide or Crest mouthwash (I have gum issues) but apparently you can't with this one. I can't comment on battery life or durability yet, but don't rate it highly because of these other issues.