It's important in some cases, let's say your bard dies and your team must hold survive the boss until you arrive in Whirlpool Abyss. Also, the lvl 12 Sky tower I believe(correct me on this) where the 4 elemental golems are. However, that floor is easy anyways. Other than that, I think it's overrated. First, you lose a Hard lot of stats that you could get from better accessories. Ballad set will not save you in lvl 60+ PVP, Centurion, and upcoming harder dungeons where a lot of high dmgs are generated that your healing harmony and holy notes are more attentive. It may be good for lament but the dungeon is fairly easy as long as the bard stays alive and keeps up with the healing harmony and holy notes. We'll see with the upcoming new skill mechanics of bard whether or not they will be a huge in the long run. As for the current content, the flashing penguin card is worth it for the extra -2% dmg taken. Other than that, just get like 180% heal or something with the penguin.