Writes with a line similar to a 0.38mm gel pen, and about twice as smooth. There is almost no friction on these. I will however have to see how they stack up against the Jetstream. As far as I have tried, the 0.7 Jetstream writes pretty well, but it is too thick for my taste. I still need to try it in a 0.5mm or 0.38mm. I will return after I have tried those.

Excellent pen. Smears badly on Tomoe River paper, however.

Very smooth writing experience! I've been using these for years!

Acroball .5's are one of a handful of pens I will never willingly do without anymore. They write very smooth and don't skip or blob. Comfortable to hold.

Same as the other pen. Works great in my hobonichi.