When I did the blue hole I was dead set against it. But the other divers in my group wanted to do it, so I joined in. I am so glad they made me go! I talk about it all the time, it was amazing! The sharks are there below you and the stalagtites are just amazing!
I would say go, it is defenitley and experience, plus the other dives that day are so worth the trip!!! Even to just do the other dives on that trip are worth the day trip! I would bet after diving it you would regert it if you missed it.