Originally Posted by
FobManX
I believe once you have Vial that AM is always worthwhile because it allows you to sync up your Avatar with the trinket everytime. It essentially turns Avatar from a 90 second CD to a 1 minute CD(there may be a few seconds overlap every once in a while depending on RNG, fight mechanics preventing rage expenditure, etc.). It also allows you to sync all 3 every ~2:30 which is nice.
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If you have AM, Reck's CD will be in the ~2:30 second range, so its worth holding on to Vial for those 30 seconds to sync them up.