I think it will depend on the xp that carries over to the outside world. They said 'a portion' would carry over to the real world. If that 'portion' is a decent amount, palace of the dead can be another choice for leveling alt jobs for people who are tired of the same 10 dungeons and fate grinding.

The amount of xp is the part I'm most hopeful for, far moreso than whatever weapon we get out of it.