Completed it with fixed party PLD / WHM / BRD / DRG.

Wiped once due to slimes. Had no other close calls. Was extremely easily.
Only problem was the time limit, which almost ran out on Floors 21-30 and 31-40. But we honestly spent a lot of time standing around talking about mobs and the music. We were also killing every single mob on every floor.
Floors 41-50 we had more than 10 minutes left at the end.

One of the members was playing DRG for the first time, so didn't know any of the skills.
Our tank was being extremely cautious. Only pulling one mob at a time through almost the entire dungeon.
I suggested pulling 3 at once, but we was reluctant. But I have never played tank, so I don't know the limitations. He must know them better than me.

Overall, easy. But fun with a fixed party. Doing it with friends makes it less grindy.

We plan to run it again as different jobs today or tomorrow.