Hopefully I still get a device with perfect power supply

Unfortunately, the power supply squeaked when first delivered device (without brush charging station quietly, with brush louder).
Even the very fast delivered by Amazon second device (warranty) squeaked, although not quite as strengthens, but still annoying. (And I hear no longer quite perfect, so I'm not overly sensitive.)
(The previous year-old center moved in the state of charge about 4W, both present approximately 1W active power [measurement is not quite as accurate, but a clue].)

With pressure from the irrigator I am with a first test also reasonably satisfied, but only at level 5. So could more.

The vulnerability with the hose will probably be more, as in previous devices.
For my previous center I could buy a replacement hose at a spare parts representative years ago. With enjoys DIY should let the also exchange information. Was not even expensive. By later rarer benefit of oral irrigator no 2. exchange was necessary. (No idea if you nowadays to even get.)

The battery lasted for many years (10 or more?), 1 person, 2 x daily brushing and always on the charging station.