Haven't done this one for lack of skill and a group to do it for now. But from what I understand, the mode is made to test player skill and coordination with other players. It can be soloed by those with either talent, or who have memorized the content enough. But it's meant to be for a coordinated group effort.
There was a similar mode in PSO1. I attempted it a few times and didn't do that bad back then. Now my current health situation prevents me from reaching that peak, but I'm sure this time around it shouldn't be much more difficult than that old mode, simply because characters have better ways to move out of danger quicker. Back then, block and evade were RNG, and combat stance slowed you to a crawl.