I have a Braun electric toothbrush at home and am used to that. It's powerful. It's great. You can't bring one of those to work, though, which is why I bought the Panasonic portable. It takes up almost no space at all. It does not require battery changes often, and brushes teeth like it's supposed to. I just wish it were a teeny bit more powerful. You don't get quite the same "awesomely clean" feeling with this portable that you do from a proper Braun home one. Oh well, such is life, I guess.
I bet this would be pretty awesome to use on vacation, since hotel toothbrushes are terrible. I wouldn't know, though, since I'm too broke to travel.