This is a massive waste of money. Frankly, think about this: do you *want* to replay this game on NG+? Do you even want to play this game on harder difficulty?
No. You do not want to do that because this is a looooooooooong game and it'll be over 100 hours when you're done with it. The bonuses are not worth it.
As other reviews said, the final boss of the bonus dungeon is literally someone whining and complaining about "gamers who spread malice over social media." Read: someone in RGG knows that this will be really negatively reviewed and he's trying to preemptively call us out on it, as if that makes anything better. You're gouging us for another $20 on top of the $70 for nothing worthy of note.
There are cutscenes that accompany clearing out the bonus dungeon, but they aren't good. Imagine this for a second: all the dudes in the party are lined up fishing -> one of them fish out an adult magazine -> and they all gather around to stare at the magazine for 7 hours (estimated time). This is what I'd call "mishandling your characters." It's pathetic, harmful and for what? A cheap laugh. This summarizes this stupid bundle and RGG's contempt for the audience.
And on top of that, I bought the ultimate edition WHICH DOES NOT EVEN COME WITH THE TWO EXTRA CLASSES IN THIS STUPID $20 PURCHASE. Disgusting. Absolutely dispicable.
In-game, the only things that actually matter whatsoever is actually the Sujimon characters - and even then, it is really low impact and not worth $1, let alone $20.