Recently grabbed the Black Ink trial from Steam and gave it a spin. Some interesting features I'd love to play around with more, but there's this one thing that really bothers me. When sketching characters, I like to make quick lines and curves, but the precision to do so isn't quite there.
As a test, I drew a series of quick circles and a majority of these come out more angular and less accurate with my drawing motion. This doesn't happen while using Opencavas 1.1 and Photoshop, which produce some nice and precise curves. Here's some comparison images from my tests;
Black Ink Curves
Opencanvas Curves
Photoshop Curves
The problem persists regardless of the brush type. Settings are left at their default. Tried playing around with some brush settings afterwards with little results. Resetting the stylus calibration doesn't help either.
Using a Wacom Bamboo Tablet.
Cheers.