Nice Madcow. I also happened to give it a go this morning now that duoing it with friends had become very easy (and it let me learn some of the later fights easier since I hadn't done them in Cata).
Did DS 25 Heroic, Fury @ 100 / iL642. Spine was pretty fun to say the least. Madness wasn't terribly bad once I made sure to handle any potential impales.
Also just so happened to get the platform achievement.