These books, as well as the eldar path trilogy, are well well written and the writers are famous GW contributors, who've worked on a lot of GW material. Their books follow the Gw fluff very closely, this whole trilogy is based a lot on our current fluff, so yeah, why not use these characters.
You've got quite a lot of material on them, a book is a lot longer than those little pieces of fluff we get in our codex. This has to be well done like like Preacher said.
People prefer going for their own guys, to shape them however they want.
If you really go through this, you need to read these books a couple of times over again, to know these characters really well, because the other dark eldar will always remember some of the aspects of these characters, if you represent them badly, you may get harassed by angry dark eldar nerds.
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