Great writing feel, and nice color as well

Being able to write sideways and upside down is also great if you're on the move and don't have a good writing surface, but that's more of a novelty than the Fisher ink refill's sheer ruggedness

The pen is smooth and has a great writing angle, It is a nice and solid replacement to the bold tip that came with my Space pen.

Super smooth writing, dark, rich ink evenly applied.

It's a real turn-off if you want a consistent writing experience from your pen.

Very smooth writing as expected

I like my write in the rain pens, but I don't like the thick point that comes with them.

Great writing and comfortable in my hand.

Very smooth writing.

and I have the best of both worlds, an excellent writing pen that is solid and looks great

A blogger wrote that this was a much smoother writing pen than the medium

Smooth writing

This is a cartridge for when you want a reliable writing instrument to work in trying times, or just to play around writing underwater, etc.

I like my write in the rain pens, but I don't like the thick point that comes with them.

Excellent writing quality in any/all conditions; Although, I have yet to put it to the test in zero-gravity... that will have to wait for now

Super smooth writing, dark, rich ink evenly applied.

I've tried all of them, and this refill (fine) is the difference between the space pen being a novelty and a preferred writing instrument.

The writing is not really as fine as I would like

oh it's just so great and lovely i just loooove this product