Pros: Durability, Refill Quality, Materials, Overall Quality
A great pen for all circumstances
The Fisher Space Pen is one of the most useful writing tools I have ever used for all the reasons it was created. My work and adventures take me into extremely cold and hot, wet and dry, less than hospitable places where most pens fail. I've used the Space Pen on waterproof notebooks in temperatures -40° to over 120° without a problem even after submerging it in water, oil, and things that would have and did ruin other writing instruments. It's ability to write evenly over oil and other substances without fading out or gumming up is worth every penny. It's the one pen I take with me everywhere I travel. Perhaps one day, even in to Space.