I started using the WaterPik 3 weeks ago based on my dentist recommendation. Mostly because I have two gum pockets that she was concerned food could enter and cause problems. The fist things that I noticed is the very small food bits being washed out of my gum lines. My mouthwash would typically get a lot of food particles out but I never remember seeing the small bits before. In addition, I hate flossing and I do not feel like I must floss much any more because my mouth feels cleaner than ever before using my WaterPik.
I purchased this to replace an older unit that finally gave it up. It is much lighter and while that is great it is quite a bit louder and noisier than the old one. I love to water floss as it is the best way to remove lots of crud your dental tape and brush could not. I own a couple of battery operated units for travel that are not as powerful as this plug in unit. It is quite powerful when set to full pressure. Tools that came with it are very useful.
I upgraded from the hand-held version of this that also worked great. But thiis is almost twice as powerful with more adjustment. The bottomline is I started using a Waterpik Water Flosser after having gum disease and the disease is gone after less than a year of use.