Not much, he's big into trad, glam, power, and thrash metal mostly as far as metal goes. He also has Winter's Into Darkness, which he bought assuming it was a Winger album, that cheapo Heralds of Oblivion Vol 1 comp which he bought believing it would be representative of death metal, and probably a couple other things I'm forgetting right now. I don't think the metalness of Arcturus was even a factor for him, because I know one day we were having a music chat and after I said I liked them, he recommended Blind Melon to me on the simple grounds that they both experimented with other genres. I've turned him onto a handful of extreme metal albums since then but he doesn't seek it out.