I just picked up an Inka Pen via a pro deal for our Search and Rescue team and so far I am really happy with it. The pen fits inside its own case and can be used quickly in the short version or converted to a full size pen with nice weight and balance. It also has a built in PDA stylus. The pen is pressurized like the space pens so that it will write upside down, in water etc. I like it so much I want to order another one and it looks like they are coming out with a titanium version in a few months!