Unfortunately, the product convinced not ...

After all the positive reviews I would have a feeling like writing with a "real pen" expected. Instead, you have to press on vigorously to bring the pen to write at all. Often this is not possible and you have to repeatedly press on or start strong.
Writing is therefore extremely difficult and hakelig - eg the dot above the i needs several attempts, beginnings of words you write often more than once, ...
When drawing the pin falls due to frequent Ansetzversuche through completely, since this reduces the precision is lost.

On the positive side, once he has stated that he then also consistently writes. Why this is so, I can not answer, unfortunately - as you can so unfortunately do nothing.
I'm staying now first continue with my "thick" Just Mobile AluPen who writes at least always, even if you often can not see what and where exactly (what was the reason for this change experiment).