I really like them. They make the old quests feel new again, and we can't just mindlessly zerg haphazardly through these quests. I ran a bunch of level 2 and 3 quests today on elite, a few on hard. The champions mostly seemed reasonable. I do think there should be a cap as to how many spawn at a time. Also, it seems like every now and then, I run into one that is just way super-powered. We found a wolf in waterworks with ~1000hp. It also hit very hard (45-80) and took down two party members before we killed it. This was a strong party and I think it would have wiped some weaker parties. I think it's reasonable for a random mob to be a threat to a single toon maybe two, but shouldn't be a threat to a whole party. Just my two cents; all in all, I'm happy for the new challenges.