I have a PGM. I was lucky enough to receive it from a friend/long term member from another forum (Merlin from NGFL).
I received with it, pretty much, all the titles I was interested in (re: KOV series, OL series, KBlade series, Gladiator, MMasters & Demon Front). It also came with SvG, however, I think it's pretty garbage, personally.
A note about the KOV titles:
KOV & KOV Plus are quite different from KOV Superheroes & KOV Superheroes Plus.
I'm a bit conflicted by them, because although the earlier two games have LESS characters overall and gameplay is improved in the latter two, the original "vanilla' versions are actually longer/bigger games, as far as I can tell.
From playing all four of them continuously when I got them, I found the original and plus to be CONSIDERABLY longer games. There's quite a lot of 'game' missing from the leaner sequels. Whether this was a developer choice (presumably?) or a memory limitation vs the other content, I played all 4 in order - front to back - and although I enjoyed more characters and gameplay improvements in the Superheroes versions, I missed a lot of the levels and length missing from the standard KOV's.
I haven't got KOV2 yet, but couldn't resist playing KOV2 9D before getting hold of it. 9D, objectively speaking, is quite probably the best 2D beat em up I've played to date. It feels like what SNK would have made as a beat em up in the Last Blade/Garou era, if they had been more capable with that genre.
Gladiator is also very good, but I still prefer the KOV series over it, overall.