Additionally, the on-screen keyboard offers a selection of usable layouts, and the predictive text and autocorrect functionality mean you can type reasonably quickly.
Syntellia's patented technology features such a powerful autocorrect engine that visually impaired users have been using it to type as easily as sighted people do on touchscreen devices.
It doesn't offer any of the predictive text or autocorrect functionality offered by the (identical-looking) keyboard you get when running an app that plays nice with the tiled interface.
Device makers try to speed things up by anticipating what we are trying to write and offering solutions, often with vexing or comical results (obscene examples abound at Damn You, Autocorrect).