I tried it as a regular brush pen but did not know that it works with
watercolor! I need to try it. As a brush pen, it's super soft, so it's not great for small detailed work, but
it's fun for more gestural work.
I bought this one to try out before getting the whole set and after the first
stroke I wish I had the whole set. If you have used Akashiya's Fude disposable
brush or Pentel's pocket brush, this is the same feel. The Pentel brush has more
width diversity but that one has longer bristles. It looks really good even
before you put water on the ink. If you do watercolors or brush painting this is
a good buy. I gave it four stars for not being refillable. The length of the
brush is really a good compromise, long so it has a larger ink capacity but not
so long that it does not fit in most pockets and needs a special case.