I don't know exactly, but using one, it has the sensation of using the trackpoint on a Thinkpad. The puck you push, pull, and twist to make the motion is a bit

I don't know exactly, but using one, it has the sensation of using the trackpoint on a Thinkpad. The puck you push, pull, and twist to make the motion is a bit springiness. The harder to push it, the faster the motion happens in the software on screen. When you release, it springs back to neutral. The old ones (late 90's vintage) had trouble coming back to center, and there was a hot key to rezero it if it was starting to drift. The newer ones don't seem to have the issue.