My WP-100 is a great design. It has a three year warranty. It doesn't take up much space on the counter. I like the on-off control on the handle. I like the storage built into the lid. It's very quiet compared to other water flossers I've owned. I floss once on the bottom teeth and once on the top teeth and my teeth and gums get very clean. I have 2 bridges, 2 implants and a lot of crowns, so clean is very important to me. There is a special tool for all of my dental work. I am very happy with my Water-Pik!