I've seen a lot of information regarding this item and the loot you can get from the chests it unlocks... But only on the PTR.
Now that the patch is live, does anyone have any data regarding their experiences with using these keys?
Specifically I am looking to know the *approximate* drop rate, or timeless coin investment needed to get a Burden of Eternity. On the PTR, the consensus is that using these keys is the best way to get Burden of Eternity. Does this hold true now that 5.4 is live?
*** UPDATE ***
According to the Sept. 12 patch notes, the drop rate for burdens from Kukuru's chest has been lowered.
Link to source, since I don't know how to Blizzard quote: