This is 2nd cata boss we managed to kill, but 1st from PROPER raid, not some easy-peasy pugable Tol Barad ;)
Killing this one took us some time. Cata content is - fortunately - more challenging than we could expect after some poor HCs we've seen. Last night, after first try, which bring us to less than 6% boss' health, we had few looong wiping hours to eventually kill them all.
So, congratulations, slackerz, get ready for moar! Magmaw is next on our list!