I bought the this because I recently got braces and was fed up with the struggle I faced when flossing. Now, I am able to clean in between my teeth easily, and I can get food out of my braces with the orthodontic attachment. Now, my mouth has a clean feeling after water flossing.
My wife and I have been using the WP-450 for over a month now. It has proven to be easy to use and clean. It takes up very little space on the counter top and the battery holds plenty of charge for the two of us. Because it is a handheld model, it does not hold a lot of water. On average, I use two tanks of water, sometimes three. If you have sensitive teeth or gums, it is best to use lukewarm water. Cold water can be uncomfortable. As for cleaning and working the gum area, it is excellent.