I love the Space Pen, but had to give it up because of two issues:

1. The Fischer Space Pen works great for about 2-3 months, and then the writing tip of the pen starts dribbling and glopping ink. Doesn't leak onto your clothes, but it does gets ink all over your fingers if you try to write with it. When this starts happening, no choice but to throw out the ink cartridge and spend $5 bucks on a new one. Doing this 6-7 times a year makes the pen's "Total Cost of Ownership" a little too high for my taste.

2. The "thixotropic" (yes, that's what Fischer calls it) ink never looks quite right -- it tends to clump and smear on paper.

Bottom line: great pen if you need to write upside down, underwater, in space, etc. For day-to-day use, not so much.