Poor! Buy a couple of strokes and then in the bin

Line and color are deficient.
The lines vary in thickness and are generally getting fatter, so that the differences between for different strengths are fluent.
Frightening even that bad pigmentation, this shows the latest on tracing paper beating. No black or similar, but verblast appearing lines are the rule.
The very thin with (0.05) break very quickly despite a delicate and proper handling (!) And just these thin are also with 0.1, if they do not break even, soon, with little or no by the stronger pins (from 0 to distinguish 3) more. I draw more prudent, in order to prevent breakage or damage, I have on paper just because of poor ink / ink of these pens, hardly anything visible on the paper, as it should be, that is a line that clearly a certain strength has and is sufficiently powerful in the shade (recognizable black).
Conclusion: Neither for the professional, even if it must go fast times and comfortable, suitable even for school or leisure, because fast beschäddigt (line width is not true), or even break off and the lines are usually very ugly and uneven in.