I must say that the feeling is basically very similar. You have to impress a little with the Pogo Sketch, so that the display responds, the pressure seems comparable to the one I used for a pen on paper to me. That is, the writing goes well without cramp in his hand. The tip of the Stifes slides well on the screen, whether drawing or writing, I had no trouble with it. And although I have even a protective cover (ZAGG InvisibleSHIELD) mounted on the display.
The letter is of course not as accurate as with a pen on paper, because: First, the Pogo Sketch has no real tip and secondly nunmal a pane of glass between the pin and the displaying screen is so that the point of contact is not perfect with the display of point corresponds to which the display shows the resulting points (dashes etc.). The latter is of course not the fault of the pen. However, you get used to it quite quickly and can produce legible typeface (much better than with your finger!). However, I can not make it to write very small, but this input method is too imprecise (here could, of course, any magnification functions of Apps help).
Conclusion: I would hope that would display a little more sensitive to the pen, but it's also so very good. What you can take your fingers, I will continue to take the finger; but writing or drawing the Pogo Sketch is a huge help and it makes a sensible letter on iPod / iPad possible in the first place.