110% wow factor but there are practical issues in that some of the
interactions depend heavily on pressure sensitive pen input. Another issue
being pens are not a very good method of interacting with interfaces. Great
for creativity but fall over (literally) when you need to put them to one
side to use the keyboard. Slick demo but I see this coming in to its own
with multitouch interfaces.
Exciting times ahead for our options with input devices.