Pilot G-Knock Retractable Gel Ink Pen - 0.38 mm - Black

Smoothness: Okay.
Precision: Not good as 0.38 mm, Okay as 0.5 mm
Weight: light
Grip feeling: Comfortable secure feeling.

Overall impression: I recommend this pen.

Con:
1. the pen nonslip cushion is solid one although it doesn't bother me significantly
2. The penpoint is not very precise as 0.38mm. It feel like 0.5mm compared to others.

Pro:
1. Comfortable secure grip feeling. (at least for a male adult)
2. If I put enough force on it while I'm writing, the penpoint give me a pleasant scratchy feeling and sound.

This pen has a very sharp point and writes in an extremely precise fashion. I really like the thinness of it and the friction it provides when writing because it gives you more writing control. I bought the pen because they say it's green friendly!