Yeah, I picked it up, and I love the music. I feel kinda bad because the games were so great but I always played them on emulators until the Collection came out - do yourself a favor and get the PS2 version (I just think SNK was stupid for charging $500 for the games on Neo Geo - but now I guess they're compelled to re-release Metal Slug 1 in every arcade collection they make???). It's a good collection, and I'm not dissatisfied with the purchase (even if I barely listen to it
It had pretty good presentation, too, which always counts.
I guess the only things missing from the collection now are 6 and 7. I don't know if anyone's ripped 6 yet, but HCS will likely have a mini2sf archive available by May.