Is the scratch any more pleasant than on a fountain pen?

With FPs, I ended up gravitating towards a buttery-smooth, can't-feel-the-paper type setups, so I'm curious if glass pens are worth trying.

Not in my experience. I appreciate the softness of metal nibs be they dip pens or fountain pens.

I had one a long time ago. It was scratchier than my worst fountain pen, very unpleasant. Ink delivery was uneven, very heavy right after dipping and then tapering off quickly.

I like it, personally.

But, it’s also tunable with some sandpaper. A few minutes with 600+ grit, some water, and test ink, and it will feel however you want it to.

Some good YouTube videos on the process.

I find that they can be scratchier, and from what I've read, paying more gets you a smoother pen.

Many folks find that they need to use some sandpaper on the tip - smooth tips make for better writing.

(I use a glass pen for drawing at times)