@Empty_of_Clouds - I totally hear you on the Desiderata. I definitely wouldn't choose it for regular writing.
I've actually had a really fraught relationship with my Desiderata. I was crushingly disappointed when it first came in the mail, and I hadn't figured out how to adjust it to suit my needs. It leaked everywhere; it burped; it blobbed; it dumped; writing even draft-quality calligraphy was out of the question; it seemed like 100% more trouble than it was worth, and inferior to simply dipping a G-nib in every possible way. I actually put it away for over a year and just didn't use it.
But then, one Inktober, I determined to only do line sketches and spend less than 15 minutes on each. I knew I wanted the expressiveness of a G-nib, but I didn't want to fiddle with dipping for what was supposed to be spontaneous art, and I find the modified Jinhaos much too heavy for comfortable sketching. So I spent some time and a fair amount of ink learning how to adjust it... and it still burps and splatters, but I've come to see those as serendipitous expressive elements. And I usually have ink all over my hands anyway.
Here's a sketch I did with the Desiderata and a water-brush. Sorry that this might be getting away from the calligraphy brief of the Forum, but probably other people here draw as well as letter. And I swear I'm not shilling for Pierre.
Does anyone else have a flexy fountain pen that they particularly like?