I had already completed the quest chain up to the point of going into DM west and downing the boss, so to me it a no-brainer to go ahead and do it.
I completed it last night with 4 warlocks and a priest. One of my locks was level 63 (leveled to 64 in the instance), and all of them are specced demonology, so it's not going to be exactly the same experience as you would have. Still, it's doable!
I posted my experience here:
DM West complete!
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