I used these pens almost exclusively for two years on my first ship. In a terrestrial environment, these pens are easily outperformed by many, many other pens. The high viscosity ink is under pressure, so it is always being expressed. Any imperfection in the ball that finds itself at the edge of the ball-barrel interface will leave you, in a matter of hours, and sometimes while writing, with a big ball of black goo on the ball, sometimes on your fingers, frequently on the paper.

They tend to gunk up and frequently blow out.

If you are going to space, get a few before you go. Otherwise, I highly recommend the Pilot G-2, specifically the 0.7 mm Navy-Blue (available in dozens when ordering directly from Pilot).

The G-7 is ubiquitous and writes fast. It's not ideal for all surfaces, but 99.9% of the time, it's the best answer.