How long does the pen, I can not judge. But it works flawlessly on the iTouch, iPhone and Windows Phone. The way to fix it via the headphone jack on the device itself I find rather not so convenient for phones, because then, of course, the sounds are switched off automatically. Sure you can then put on vibrate, but that I do not always. For my E-Reader again, I think it would be awesome in practice to be able to use the headphone jack as a fixation. I'm just a little skeptical about whether I allow the socket to permanent not a shame. That certainly depends on the individual use. As for the material, I agree with one of the previous speakers on: It would be great if the outer material of the pen would be such that it does not cause scratches on the touch screen when you transported him to the unit.
