[iCarrot]

Well that is because the Japanese nibs are finer than the European counterparts, largely because of dense kanji characters. The rule of thumb is always go one size up for Japanese pen. I have a Metro M, it is smooth as butter.

I'm also eyeing the Twsbi Go line. If it write comparable to the Eco I'll purchase a bunch of them as gift (friends seem less intimidated by the unassuming pens)