I bought this a month ago and wish I had bought it years ago. The Waterpik does an incredible job of cleaning your teeth and making your mouth feel fresh. It's mandatory for anyone who has ever had gum disease and has trouble dealing with the pockets between the teeth.
I recently purchased a WP-100 to replace my 30+ year old Waterpik. The new unit is much quieter than the old unit, but seems to clean more effectively. My only complaint is that the WP-100 does not hold as much water as my older unit. I find myself needing to add some water to finish the job.
It is like the refreshing, clean, healthy feeling that I used to get with the old-fashioned cleaning at the dentist office. I use it several times a day.
Just bought this replacing old one that leaked. Waterpik does an excellent job, however, it is noisier than my old one. Have to put a wash cloth under it to absorb some of the noise!