Just wanted to let people know that the Rotring quattro pen / highliter / pencil / stylus is a good little unit. I picked up this pen to replace the Lamy Pen / Stylus combo unit that I had previously. The mechanism on it siezed up and it stopped working.

The rotring has a gravity operated mechanism, as opposed to the twist mechanism of the Lamy. When you replace the pen in your shirt pocket, the pen automatically closes, keeping your shirt ink free.

I got the older model which has a nice painted black exterior. The newer model feels more plasticy, but has a nice bulge where the grip is.