These are my favorite pens. I picked one up at an independent art supply store and had to buy my next few online.
The tip is so fine but it isn't scratchy, it doesn't feel like an xacto knife cutting through paper (like other extra fine tips). The flow is so nice, this does mean that the ink will smudge if you drag your hand on it soon after writing, but once it dries (quick drying) I've had no issues.
My biggest complaint, and this is true of most extra fine pens, is that the pen body itself is so skinny. If I'm using this pen for over an hour in class taking notes, definitely doesn't feel great at the end. I've had to buy some of those pencil grips for children, they slide on easily as the pen is about the thickness of a pencil. I feel a little silly with the grips on but it has changed my life!!
Favorite pen, never stop making it!!