I got my Dreadsteed yesterday (yay!) and I've got to say the questline was quite fun. At least - having an excuse to take a peek at Scholo, which I hadn't seen before, was enjoyable. For my group I had a tanking pally (one of those blessed souls who'll help anyone with anything), a 70 lock with the mats, a 69 lock also on the quest, me at 62, and a 60 holy priest with a serious case of nostalgia.
Scholo was pretty chaotic. The pally would gather half a room's worth of mobs at a time, while the healer was tanking UB on her other account. The 70 lock was a bit cranky because he didn't need to be there for that run. The 69 lock wanted to complete quests that had to be gray for her. And the 60 priest, despite tanking at the same time, wanted to approach the instance as a serious run for "old time's sake".
The DM run went a good deal more smoothly. But when we got to the summoning ritual, it proved to actually be difficult! Trying to get everything down as fast as possible while keeping all the demons off the 70 lock and the healer had us really hopping. I died, though I was still able to complete the quest.
If it was challenging to a somewhat overconfident and seriously over-leveled group, what was it like when the whole party was level 60?