I got this on my first try after finishing my Rindomaru and Fay Gendawa. I had checked possible augments everywhere and +2 double attack seemed pretty rare so I did not want to pass the opportunity up. From what I hear though, I should have tried to get STR instead of attack and more base dmg... but meh still beats a Byakko axe and I don't have a perdu so I guess I'm good.