I bought the Panasonic because of the mostly good reviews on Amazon and have to say it is indeed a good device. It fit it even the Oral-B mouthpieces which I can continue to use therefore. This is quite a good thing, since only a mouthpiece was included and the rest of the family but also gladly did occasionally use the irrigator.
The, compared to stationary devices, chunky irrigator is at the beginning a bit strange. But that weighs from the missing hose on which you are otherwise always connected. And where there is no hose is because no one can break down even more.
Negative is not yet noticed that the supplied batteries have not kept too long. I'll try to work with rechargeable batteries in the future.