OK, so I got my Jinhao 159 and it is a GREAT pen. However, I mounted the fude/bent nib on it and I am slightly disappointed; well, basically, it is like writing with a bold/thick felt pen... It is OK though. So later on, I placed back the original M nib and what a pleasure. The nib is so smooth and the writing so fluid. By the way, writing with a fude nib will drink your ink, literally.
Yes indeed, but it's not very intuitive, at the beginning it's like writing with a felt pen, it demands some practice I guess. On the other hand the bent nib is basically for writing Chinese/Japanese characters (kanjis and the like).