Morgan is best known for his Takeshi Kovacs series of far-future sci-fi stuff.
I was surprised to realize that this is a fantasy. I was pleasantly surprised to realize that it carries over the grit and cartoony chaos of the Kovacs stuff. It's not often that your (male) main character is not only gay, but actually gets to have sex.
The plot is occasionally confusing, but pretty much comes back together at the end. There's no indication of it on the book itself, but according to Wikipedia, it's the first of a trilogy.
Nomadic horse clans are the new elves.