I purchased this for my son because he got braces.I originally purchased the less expensive starter one and it was time to upgrade. Love all the different heads included. It could be better though.The water comes out great at first but you have to quickly start maneuvering the the Waterpik to keep the water coming. It is annoying. The other issue is that there is always a bit of water left trapped inside which bothers me. It is an average product and it seems to do the job.
This is my 2nd WP-450 in the past 6 yrs. The first was very nice & had I not dropped it, I would still be using it. The new one I bought a few weeks ago, is much less powerful, even on high. This is a disappointment.