These games are a treasure to the RPG community. Do not miss the OSTs for these games as they are among some of the best you are ever going to hear.
I will make this one point, however. I thought the battle system was weaker in this game than the first two. That said, it was interesting in a way as well.
I still own the Art book for this game and Ar tonelico 2.
Please bring us these treasures of the RPG gaming world.