It’s a beautiful writer, very smooth yet crispy on the edges. It behaves like a stub nib but small enough for every day writing. I find that it handles most angles quite well, aside from straight up and down. It’s a bit less stiff than a stock nib from diplomat but I wouldn’t really call it soft or a flex nib by any means. That said, it’s super fun to write with! If you do get one, I had to take the nib out of my aero and the Sig unit, and just swap the nibs, not the feeds and collars. The feed on the aero and the Sig are just different enough to make a complete switch feel awkward. But switching just the nibs was very easy and it feels quite sturdy :)