I got my lock to 90 a few days ago and put a solid 6 hours into the quest today with an ilvl of 480 pvp gear before I got it down, I can honestly say I'm a hell of a lot more confident with warlock now than I was before. Being able to micro manage a pet in general while still performing is very important, especially at high level play.
Honestly, i was really surprised by this fight, everyone was telling me about how hard it was and I thought that it couldn't be that bad, boy was I wrong. I'm SO glad that Blizzard FINALLY put some solo content into the game that's challenging, if you're not in a bg/arena/raid then there is literally nothing to challenge you. I look forward to more class quests in the future I also hope that this quest gets buffed accordingly every tier, otherwise it's just going to be another MoP legendary that nobody gives a shit about.