I have only finished it once, with my two FC mates and a random from Duty Finder, but I would much rather spend the time in Duty Roulette on other dungeons. I hate tanking that dungeon. I will try, but most groups I enter will disband before we finish the first boss, usually 3-4 tries on them, and I do nothing to encourage repeated attempts. Even Siren herself is not as difficult as that first boss, in my opinion. I just think the encounter needs to be re-evaluated before I ever attempt this with random party members, much less those who are much closer to the minimum iLvl than I am.