But:
I have no experience with rollerball pens and their "life" in use.
I use it every day in the work. I also need to write a lot above average. So a mine is empty in about 2-3 weeks. Is that normal?
If you add the cost of mines and their life against each other ... it is a long time "a small fortune" from.
I wanted this rollerball pen - so I have to live with it ;-)