If you do end up doing this dive one day, I'd recommend that you do it near the end of a long week of multiple dives so your air consumption is much improved, you are more at ease with your pre-dive routine, and the dive masters know you well. I would also mention that I'd have your normal night dive light with you, not just your back-up light in a BC pocket. Whatever you do, go in a small group of 4 or less and try to be the first one through right after the DM. One of the "turns" is more like a "head first verticle decent" and if you don't see the person in front of you invert and head down, then you'll be wasting air in a stall pattern trying to "see" in the dark for the hole the diver ahead of you just dove down through...
It is however a true beautiful dive to come down headfirst out of.... Watch your computer and depth gauge! It's so deceiving that deep when you've just come out of darkness into the lush, blue abyss. Yes, it's a trophy dive like mentioned above and a rite of passage so to speak, but just make sure you are ready for it so you won't feel stressed over the hype of it! Relax, breathe and enjoy your other island dives until you decide to tackle this advanced dive site.
PS, out of 9 trips to the island, we've only done this dive twice. Both times we spent too long waiting on the other divers to pop out of the darkness and didn't get much more of the dive completed. When you are that deep, waiting on others is NOT my idea of good use of air in my tank, so that's why I mention the number of divers in your group and my other suggestions. Hope this info helps.