I haven't read the latest issue yet, so I can't say how well he's fitting in there. He wasn't so anachronistic in Spike vs. Dracula, though, and I'd recommend reading it.

Isolated bit of poke-fun-at-the-ponce:

SPIKE: When it comes to Buffy, I know everything...including knowing in the biblical sense, nudge-nudge, wink-wink.
DRACULA: Nonsense! You...and that glorious creature?