Until tonight, I was not sure if there was anything special with the chests. Unless I just happened to get extremely lucky, I'd say yes...the chests are much better and thus the quests worth running. Out of about 25 pulls, I found 3 missile weapons with completely max stats other than missing a Blood Thirst (I also found a couple others with Legendary Blood thirst). A few other nice items as well...and a bunch of crap to go along with it. But overall, I never pulled anything like that off a few thousand tier 8 critter corpses. So in case someone has been avoiding Legendary Key quests cause they don't seem worth it, I'd say they are worth it. Just an FYI.
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