I like bare bones mark down editors a lot -- got so sick of the bloated stuff like MS Word, which tries to be both a layout tool and a fancy "meets all needs" word processor. Markdown and full screen support are good enough for me for the composing stage. Whatever my editor or my producers need, I can easily convert to it.
I write screenplays in Highland (fountain markdown), then output to FDX when they get optioned and go into production. At first I thought the various markdown/anti-GUI apps were expensive. But, when I am forced to work on my Windows PC and I cannot find anything that comes remotely close to the ease of use and functionality my Mac apps, I want to pull my hair out. (For screenplays I will use Fade In, which is cross platform, but my 1st drafts are better served by Highland.)
All that said, Ulysses is a good app. It'a bit bloaty, and, at least on the iPad, how it handles remote connections like Dropbox (you can copy to ulysses, can't save out) is bizarre at times.
My go to apps are IA Writer (despite their earlier kerfuffle with version 2.0) and Highland. I use Ulysses for fiction, where it is good for breaking up scenes and chapters; it's certainly much simpler than Scrivener, which I kind of love and kind of hate.
That's a long 2 cents.