Mostly OK
Works with my 663, easy to install. Two things I don't like are how the handle is too large for the holster and it falls out all the time; the other is that there is no switch to control the jet, only a button- which would be fine if you depressed the button to spray. But you depress it to stop the spray, meaning if I turn the waterpik on before I push the button, I'll get wet.
Rating: 4 stars