i thought it looked like a load of rubbish the very first time i saw it. who would want to stick that monstrosity in their mouth? when it comes to this kind of gadget i'm not interested unless the world leading brands are doing something ie Braun, Philips, Waterpik etc. only then do i believe its a good idea. anything else is just someone trying to make a fast buck.
Oh dear. I bought one for my Dad's Christmas. He's impossible to buy for, and most presents (unless they're whisky) end up in the back of a drawer, so I thought "that'll do". Maybe it's been bought by lots of other people with similarly difficult friends/family!