Surprised nobody has said they would buy this, though some could see the benefits. If it works as good as my electric (Oral B, one of those expensive ones with the charging base and the 30-second alert so you know to change quadrants) I'm all in. I hate brushing my teeth but do it pretty religiously, and if I can not do it for 2 minutes twice a day, sounds like a pretty good use of my money.
Someone else mentioned that they could brush easily after every meal and that seems a good idea as well. Also, whenever I don't brush it's because I'm late for somewhere. It's easy to say "Crap, I don't have time to brush" (even if it's a lie) when that time is 2 minutes sat in front of the mirror. Less so when it's 6 seconds you could presumably do while doing other things.