It is easy and intuitive to hold, and most importantly, weighs like a normal pen. In terms of precision and accuracy, the tracking of the DuoPen is good. There is a reliable feel to it. Relative mode means the movement is exactly like that of a mouse. You can lift up the stylus, reposition it, and the cursor carry on moving from the previous position, ie. relative movement.
Absolute mode is a different concept.
Simply imagine the E-Pad as your monitor. The four corners of the pad correspond to the 4 corners of your monitor. Where you place the stylus tip on the E-Pad will correspond exactly to the cursor position on your monitor. Under relative mode, the speed of the cursor can be adjusted via the software driver, just like a mouse. This of course, is not applicable in absolute mode.