Well, two things:
1) When this first came out, people spent a long time (as in, weeks at least, possibly months) figuring out the fights before they were able to clear the whole thing. Some raid groups/kins probably never beat it on-level. Not to be a party pooper, but just a fair warning that if no one in your group knows this raid you're not likely to just breeze through it.
2) That being said, there are things available to level 50 characters in game that level 50 players on-level didn't have. Player stats have changed so people can probably be much better statted for their jobs now (better healing healers, tougher to kill tanks, harder hitting DPS) than they were on-level provided they trait and gear correctly. More importantly, though, current ~level 50 players have access to Legendary Items that are vastly more powerful than the best stuff that was available in-game when Rift was the level-cap raid.
So, I'd suggest bringing at least one person who has run this before and can help explain some of the fights, but still be prepared for a lot of tough fights. As shown in the screenshots above, one or two level capped players can basically trivialize this whole instance, so if you want a closer to "authentic" experience I would avoid bringing in any high-level toons.
Ulver - 85 Runekeeper | Grevling - 85 Burglar