Well, I finally got it today and used the 48 hour free PS+ trial to finally get to co-op it. I'm close to the second boss, and so far it's exceeded the previous DLC by every conceivable margin. The environments are way more interesting, gorgeous to look at, the level design feels dizzyingly complex as it should, the atmosphere is tense, the enemies varied and mercilessly brutal. I've helped beat the Demon Prince at least 5 times now, but funnily enough I got off really easy on my playthrough. The game somehow glitched so that when the Demon transformed, it didn't show its health bar. When it appeared, it was already empty. It took literally one hit, and the boss was dead.