I'm thrilled with new handheld Waterpik. I have had some periodontal issues and I floss between and after meals. This device makes good oral care so much easier. My mouth feels much cleaner after using Waterpik as opposed to hand flossing. The reason I chose the handheld instead of the Ultra is because of counter space, its much easier to store when not in use.
I've been using a waterpik product for many years the only negative was that water sometimes would Splash around so I ordered the wp-450 and at the end of my shower I turn off the water and use the portable water pick in the shower stall. It has plenty of power and holds a decent amount of water. Terrific product I would highly recommend it!