I've long been a Waterpik fan. I've had several through the years and so far this is the quietest. They've all done a great job, but I really appreciate the sedate hum of my new one.
The Waterpik is awesome; I'm disappointed in myself for not purchasing this years ago! The resulting fresh, clean and smooth feeling from using it daily feels like I have just been to the dental hygenist. I highly recommend this model due to the numerous pulse settings and attachments. Note to manufacturer: seriously consider adding your tongue cleaner attachment with this model.
I bought this about a month but noisy running. good pressure, does what I need it to do. Previous had a different model many years ago and think I had a better machine in the older model...I will continue to use this and if my next dental apt is improved then it too will be a winner.