I've actually found that his artwork is a good indication of the quality of music. I have a ton of CDs he's worked on and very few do I dislike, in fact, I may not dislike any at all. I know A Triggering Myth is a little weird, not really my thing, but it's not bad. I think that's generally how I feel about some others, too.
I still want that Shadowdance CD. I love that cover. I've never heard the band, though. Any good? Anyone know?