I have had the unit for 3 weeks now and works very well. I replaced the rechargeable model with this one as the rechargeable unit I had for about a year and a half and it has slowly declined in performance as it would not hold a charge and did not delivery the expected spraying power.
My Dentist recommended this to me as I just had 2 implants down. Was the best investment because I can clean in between teeth and wash / rinse my gums. It is like having a mini power washer for your mouth.
Bought 5 weeks before dental appt and the improvement was noticed by my dentist. I had the WP-460W portable water pik but this one is better as you can floss longer.
I bought the waterpik a month ago and its the best product I ever invested in . It has made flossing faster, fun and easy . I have braces and its a hassle to use the regular floss with the waterpik I am out the bathroom in 90 sec I so love the product stand by it and always suggesting it to my friends family co-workers , ill tell any one who wants to listen , its the best money Ive ever spent ...