I really enjoy my Waterpik 450. It is the 4th one I've owned and replace with another one as soon as the current one wears out. My teeth feel dirty until I use my WP-450 and from that point on I can't live without it.
This is a very good product. I have teeth where food gets stuck all the time. This gets all stuck things out and makes my mouth and teeth feel very clean. The only thing that I don't like is I run out of water.