I have one of the “bullet” space pens, that I got to check out if it worked as a pocket pen for me.

The short version is that it didn’t.

I think it is a great pen, and if you need something very small or something that will work anywhere, this is it.

But it didn’t really work out for me for a number of reasons.

1. I lost like 5 clips in a month
   
2. I prefer the P8126 refill to the space pen one; or a god gel ink pen.
   
3. It wasn’t the worlds most comfortable pen to write with for me.

So I ended up going back to the Pilot Metropolitan and later changing to the Ystudio brass portable pen.

It’s a cool product though.

I’m not sure if I recommend it. Except for very particular use cases.