If you take a moment and see that AST's speed buff for the whole party is 5% for 15s and the minimal chance you get it is every minute (If you're the luckiest person in the whole world), a guaranteed 3% buff for 30s every minute is proving to be worth it.
People complained that Presence of mind was nerfed from 30% to 20% and selene's buff from 30% to 3% (me included) but if you consider that it affects the whole party... it's a fair trade. And a group esuna helps too. Selene is my main main fairy from now on.