I've been through three of these pens in the past year or so. Little things keep going wrong with the construction - the top cap shot off, the bottom cone wore out and no longer stayed in the canister of the pen, the threads on the two main canister pieces wore down too loose, etc.
It's a great pen... while it lasts. It feels like a bit of a money dump. I don't want to have to keep paying $10 every three months to get a new pen. I thought I was investing in an executive style pen that would last me for years.