I played this version of IIDX while I was living in Japan and, yeah, it was cool! I loved the style, but given that there were no EN options at the time I was struggling to understand and enjoy the game. Going back now, I actually quite enjoy playing this release, but I think that it has objectively been surpassed by future releases. Unless you're really jonesing to play some songs that have been removed from future releases, I don't think there's a major reason to go back (though I do hope they revisit this theming in the future).