Nice design, but poorly designed for writing

I was attracted by the design, transparency and compact size.
However, the quality of a fountain pen which lies in its pen (forms of attack, flexibility, flow) and the ability for the user to adapt its handling to the instrument.

The pen has unfortunately not a homogenous performance in all directions, and if the full effect / untied it issues (what to my taste than excessive) can be attractive, it is sometimes completely dry up in the vertical layout over there of some letters. It is painful to have a board of, or t, because the first track was dry.

Perhaps this is due also to the "grip" of the pen, designed in the spirit of Stabilo Easygraph. The problem and unlike a mine door, there are a thousand way to hold a fountain pen. This grip quickly becomes uncomfortable, because it imposes an angle between hand and pen flange that feels natural to the user.

I have not yet tested the largest model in this series.
Perhaps the design is it ergonomically more careful