I'd say the major issue is that the iPad doesn't "quite" do stylus work well - if you watch the video, the woman doesn't rest her palms on the device when using the stylus. If that actually is supported, I'd be thrilled.
I'm pretty good just signing and writing with my finger on a touch surface regardless - I'll have to try it out - I'd love to be able to send something through an app with such an authentic look.
People have always spoken about why 'palm rejection' is important, and I never understood why. I didn't rest my hand on my iPad when I wrote. Then, it came to me. Being left-handed, I could never rest my hand on a page as I would get ink/graphite all over it.
Maybe those of us who were less fortunate in the 'handedness' area actually write better on electronic surfaces with styluses.
Felt actually does have a pane that you can pull out to block input where you might rest your palm, and the quality using just a finger is surprisingly good.
I'm pretty good just signing and writing with my finger on a touch surface regardless - I'll have to try it out - I'd love to be able to send something through an app with such an authentic look.