Attempted or killed it?
Yeah, it's a bit rough. It's all about reacting. If purple is ever up, you want any damage reduction cooldowns you can get, especially raid wide ones.
Killed it. Actually, we killed it about a week ago, but today was my first kill. And considering I failed horribly the last times we tried, it gave me a massive ego boost.
EDIT: I am also absolutely sure there's a Blizzard employee who just works on proccing Surge of Light for me. Desperately clicking Flash Heal? Lolno, SoL never comes. Purple up and I can't heal much. SoL everywhere. Healing after the fight? CHAIN SoLs, up to FIVE!