here's a post straight from the DU that goes into a few features that are pretty exclusive to this rom atm as well as a nice feature list at the bottom ;)
Dirty Unicorn Rom (5.1.1) on my SGH-M919. Positive they have a i9500 version. Had been using Google Play Edition until a few weeks ago but it appears development has slowed/stopped at 5.0.x, with no new update since early/mid July. Both are great options, GPE is designed to be pure android. Dirty Unicorn has extra features like PIE and CM Theme engine. Both have been completely stable on my S4.
First day on 5.0.1 Official on DU. So far it's amazing. It's reported to have amazing battery life, also it has as much if not more features as CM11s, which is what I was on.
Yeah, the most unfunny joke award goes to... Dirrrty Unicorns team!
I have checked and it was actually a joke though: http://dirtyunicorns.com/2019/04/05/official-13-1/
Way to make their little known ROM even more obscure.
Take my advice with a pinch of salt but Dirty Unicorn is excellent. The salt part comes in when Android N got released and I switched to stock because I wanted to try it out. It's not very good and made it laggy but I don't use it enough/too lazy to switch it back (I have a laptop and Desktop too).