About 50% of the way through, and I have to say I am not a fan.
It's a Night Lords book about Night Lords things, so if you are a fan of torture porn it might be for you.
The characters seem a lot less fleshed out than ADBs characters. They seem like cartoon characters in comparison. Most of the Nightlords are just a name, although many are introduced with a specialisation at the start. At any point if one other than the main character or second in command appears (usually just to be killed off quickly) I find myself asking "Who is this again"?
The characters dont appear to have any personality beyond "Night Lord". I find it very hard to root for the protaganist. He does horrible things for little to no reason. I get he's a Night Lord and this is how they act. But I'm able to root for plenty of other baddy protaganists from Walter White to Talos Valcoran. This guy I have little sympathy for. Very early on in the book he starts torturing and killing some civilians, essentially to blow off steam. ADB would have handled that a lot better.
I'm sad to say there's a decent chance I wont finish this book.