Finally got a copy after quite some time tracking it down. Man was it worth it. I was quite familiar with 2/X's music but I'm amazed at how good the music from 5 is (3 is also insane, but I already had heard quite a bit fo it playing the game). I miss a bit the more military theme of the earlier games, but it's so good it just makes up for it.
I'd say it's already worth it
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My old Stepmania simfiles:
here and
here
MAH BOI, this peace is what all true warriors strive for!!