Sharpie

This is an extremely good pen for anyone who likes fine tip black pens and needs to be pretty mobile.

PROS:
Design is unconventional: The pen is kind of blunt at the end, and the contrast with the tiny retractable tip is really striking. However, some people hate that look, because it's fairly unique and bold. Same goes for the long retracting button.
Retractable tip doesn't dry out easily: You will not have problems with the tip drying out like you do with other pens & inks.
Ink is dark
You can stick this in your pocket and not worry whether the cap is sealed.

CONS:
The button on mine is kind of wobbly. This could be fixed in later versions, but it's not engineered to extremely close tolerances or anything like that.
The tip o...