To not make this review...
To not make this review too long, I'll get to the point:
Smooth, the line varies in a thin measure (it looks different but doesn't get to
be as thick as the G-pen or some other pens), it holds a lot of ink and the line
remains constant and neat without any problem. Although I've read in
descriptions and so that it's special for writing, I use it for drawing and I
get amazing results.
I recommend it, and although many people give a lot of credit to the G-pen, I
personally prefer this one. I works great for making: characters, dialogue
balloons, writing, speed lines... well, everything except light effects, for
those you need a G-pen or a Maru (round) pen.
Now, my words are not law, I can't guarantee that you will like it as much as I
do; in the end, everything depends on the artist rather than the tool.