The tools are quite limited, just a small selection of brushes and erasers. But you can vary the line-weight easily with a slider at the bottom. It is very easy to ink a drawing and the brushes behave well and predictably. Here is one of my old judo drawings which has been inked really quickly. Further, the program handles layers in an admirable way.
The program has some drawbacks, in my book the main missing features are:
- Vector selection.
- Filling, ideally including gradients.
- Export to a vector-based format.