I tested on a Windows 8 "Lenovo Tablet 2" (+ Android) pin "JotPro". Compared to the original Lenovo pen he has very very bad hand. Did I wanted him because he entsprich in shape more like a ball writing and therefore better in your hand. (Lenovo Pen is quite short and thin) - which he does. The JotPro is good like a pen in his hand. At the top of a Kunstoffscheibe is attached, which is probably meant for better gliding on the display.
The movements of the pen are poorly recognized, especially immediately after the exposure, for example to draw any lines. A smooth writing à la Handwriting is not possible. Simple sketches yes, please no drawings!
Insgeasmt tested on 2 Windows Tablets and Android 1 - always the same effect. Have sent him back.