Excellent condition. As far as I know, I am the second owner of this lens. I bought it off of the used Amazon section because I needed it for a shoot a few months ago QUICKLY, and that was my only option. To my surprise it was in great condition when I got it. I've only taken it out a handful of times since then. It has been replaced by a 70-200 so it never got much use. Typical dust inside the lens, otherwise barely even shows signs of use. Comes with both caps, and original Canon box (not pictured).
Asking $325 shipped and PP'd within the CONUS.
Picture taken at f2 with 100% crop below:
I shot a lot of these pictures with the 100mm as well: