Review (1/5): I have yet to find replacement heads.  So this is just disposable?!?!
1st impression: It works. But in 3-4 months it's going to only be good as a water pick because iI just searched and they don't sell replacement brushes...
After one month of use: Both mine and my wife's brush is working intermittently. The water pick pump keeps engaging and the brush doesn't.
If you could see my face you would be looking at regret.