Review (4/5): Ideal for braces...
While this is a bit bulky to travel with, the USB charging is very convenient (It's a dedicated dongle however). The power is not as much as a corded water flosser, but a lot of times you really don't need that much power to get the job done.
I think the best thing about this is that our middle schooler, who has braces, can take this along and clear her braces at school or when at a friends house.