Fun to try, won't be buying again.

pros:
-straight forward and pretty easy to use
-decently priced.

cons:
-takes a bit to get them to work, not sure if it's an issue with the ink itself.
-requires pumping every couple strokes to keep the paint flowing,
which is a bit inconvenient when working in larger areas.
-I find it dries too quickly.
-because it is oil based, ink that's been drawn even a week ago may smudge.