Even though I have some mid level characters, I always specifically skipped Illusion of Moon (Payon dungeon) So when I finally visited the place, I had low expectations but you know what? I actually kind of like that one now. Its pretty simple and straightforward but the music seems to fit really well. The monsters in the area are not exactly dancing but they sort of bounce around and keep rhythm with the sound and bgm. Although I would still guess that it would not be so great on a low level character that was not able to deal with the Ninetails.
Which Illusion dungeons do you think are good for whatever reason? You can also mention any that are not so good.