Friend of mine is doing a White Scars successor chapter. He's new to 40k and had originally settled on a custom chapter after finding white too hard to paint, but is now leaning towards the Dark Hunters.
Now, I can't say I've ever heard of them before, but he asked me earlier to clarify the following sentence (this is from a 40k Wiki):
"The Dark Hunters' first campaign as a Chapter saw harrowing fighting against the Daemon Engines of the Warpsmith Hilghar, and the mutated Warlord-class Titan Repellus Maximal during the Battle of Bloodsteel. This campaign has left a deep-rooted mistrust of the machine within the collective psyche of the Dark Hunters"
Specifically "This campaign has left a deep-rooted mistrust of the machine" - he was wondering about their useage of things such as tanks, transport, dreadnoughts and bikes.
As I said, I'd never heard of them before so I couldn't really help him, other than explaining to him how technology is viewed in 40k (by the Imperium at least) and how the Imperium and Adeptus Mechanicus operate within these technological constraints.
I'm hoping someone on here knows more about these guys and could help answer his question or provide a deeper overview of them. I don't have the new marine codex, but from what I gather, it lists little more than the wiki page does.