Also the video from Bun tang,
https://www.youtube.com/watch?v=f1LeURVZw3g
shows very fast scribbling.
I think it's an interesting review (though visually not very rich).
Incidentally, it shows a possibility I did not yet think about
: he writes music by loading PDF files with empty pentagrams and fills them in with the stylus.
Among other things, I also note the interface as pretty responsive.