I had one of these some time ago. One dentist professional told me not to use it, so passed it on to a friend. Later, a new dentist said yes, use it. Floss, then use water pick, and then brush. Teeth and gums seem to be much better. Seems to hold charge well.
After visiting the dentist and was told that I had gum disease, it was absolutely necessary to purchase the WP360 immediately. My gums now feel stronger and less diseased.
This is my first Waterpik, recommended by my dental hygienist, and I don't like using it at all. It's awkward and clumsy. I wish I had bought the full size and not the portable. I do like that it does get particles out of my teeth, though. I may use it for travel, but that means I would have to spend the money to buy the full size for daily use, and it's very spendy.