#0 - Nov. 4, 2010, 7:24 p.m.
Their experiences seem to be based off of heroic modes with the most recent beta patch (and some last patch).
http://forums.worldofwarcraft.com/thread.html?topicId=27497536220&sid=2000
They made really good points so I don't really feel comfortable trying to sum them up since I have not done the encounters. I HIGHLY suggest you read the first, second, fourth and 6th posts (the ones by premonition players).