I used to until it levitated off my keychain. Any one want some refills or an extra cap/ring assembly PM me, happy to find a home for them.
I now keep a Zebra pen and pencil set in my mission wallet.
I also keep a
PicoPad (some sticky notes with a small ball point pen in my regular wallet.
A good shooping spot for a variety of pens, pencils and pads is
JetPens. Just a satisfied consumer of all of the above.