Ran this last night and it was horrible. In 3 hours we got to the last boss but called it because it had gone on for far too long. We took a guild group so we were on vent and someone was giving us strats for the bosses. Our guild team is up to Cen on heroic so our gear level is around 840-860. I think my biggest complaint is the walk backs. I'd say walking easily counted for around 30 minutes of our run. Honestly I expect nerfs to this because it has far too difficult for the average and I see no chance in hell that a pug would be able to clear this as people would get frustrated and bail.