I just tried typing "Rear light" on my iPad with one finger of my right hand while holding the pad itself with my left hand. It took about 2 seconds. On my iPhone, with only my left hand holding it and using my left thumb to type leaving my right hand doing nothing, I can bang that phrase out in about... 2 seconds. In the promo video, it took the guy just about 5 seconds with the pen.

Not that this matters a whole lot - just adding my own data points to the discussion. :)