I've been using my waterpik wp-450 for about a month. I've never had one before. It was a little tricky to get used to. After some days of spraying the bathroom with water, and much practice, it's kinda fun. Really squirts fast! The only negative, is, it is pretty loud. I'd recommend it, though.
A replaced product as an older one stopped working. However, I am having a problem with this one because the round "door" doesn't close well or stay shut.
I bought this as a replacement for my old waterpik, and couldn't be happier. The modifications WaterPik made have improved this product by making is faster, sleeker and more efficient. I'm sold!
Bought the waterpik flosser plus about a month ago and it works great and dislodges food particles that always seem difficult to get out by brushing. Use it everyday and haven't had to charge the battery back up yet. Good buy!