Hands down, this is the best water flosser I have used. While comfortable in your hand, the variety of settings and easy to reach placement of the buttons make this tool a well planned device. As far as functionality, I love how clean my teeth feel after using this tool, definitely much better than regular floss. The USB charger is especially if you are on the go and don't have a regular charger handy. Love Nicefeel as their products definitely reflect their name.