Proloque2go is awesome assistive software. My wife teaches people that have had strokes, MND etc to use it, and one of her co workers uses it for kids with speech difficulties.
Pre ipad/iPhone, this sort of software/ms tablet would cost you around $15,000 AUD. Don't ask me why, that was how much it was.
Ipad and software combined now a lot less than a $1000. And instead of heavy and embarrassing, people actually want to carry it around and use it.
The iPhone 6 + size...