It took me about 15 tries with 528 iLevel. A mix of PEV and PVP gear. knock it out Saturday. I wasn't going to give up until I nailed. I wanted it before the patch.
When I got him to 20% health my heart was beating and my hands were shaking. The 3 time before that I wiped at 33%. Once I killed him it felt great b/c I stop playing my lock in CAT and only took him to 90 to get the green fire.