I use this as a companion to my Pentel standard and light black brush pens. This
is a colder, lighter grey than the Aquash light black, and it also runs a lot
more dry. I wouldn't recommend using this on anything other than smooth paper.
It skips like crazy on anything else. Squeezing the body hard doesn't give me as
wet of a line as I'd like, but it CAN result in a big ol' drip forming at the
base of the brush. Something to watch out for.
Overall, I prefer the light black pen, but this is still very useful, especially
when I want different "colours" in a greyscale picture.