The lady in that video was using her Nokia and expecting instant feedback, she should be on the testing team
take a look at this video of the same lady demonstrating on another massive Nokia Symbian product:
the X3 touch and type.

she is just as punishing on it, but the system kept up with it well.
http://www.youtube.com/watch?v=AVJ552BNeKY

Nokia devices are robust and she has fast fidgety fingers and cool set of nails.
I bet she can out-type any of us at SMS messaging.