Just to show one thing I like with the device. Taking freehand screenshots of anything on the screen:
Hover the pen over the screen, press the button and start marking the freehand area you want to take a screenshot of. When the start point connects with the endpoint the area is automatically saved to the clipboard.
You can then import the picture to your program of liking and continue the editing or just save the picture for future reference.
As a quick example:
The picture included was taken from two screenshots on how to configure the stylus button setup in LectureNotes. I imported the two screenshots into LectureNotes and added some arrows and steps. I then made a new screenshot of the result from LectureNotes. (One thing I haven't figured out yet is how to make the freehand capture less wobbly, it would be nice if it could just draw a rectangle around the area to catch. Currently you have to be very sturdy on your hand and at the same time press the button while marking the area to catch)
I could just as easily have imported the picture to Skitch, PicSay or any other app supporting image import to continue the editing it's only a question of preferences.