I picked up a JP copy yesterday along with my copy of Soulcalibur 4 for the 360. Great little title so far, I think I made it to level 9 in the short time I put into it between fights tonight on during the EliteXC show on CBS.
The design is pretty true to the original, though I'd say that the levels seem shorter and more objective based- it's still Bangai-O, though.
The really weird thing to get used to, though, is the controls. It doesn't use the 360 degree radial controls from the original (it had that, right?). In this one, you use the d-pad to move your guy, and you use one button to shoot (only using one button for both directions, that's the difference, that's what's harder), one button to boost, and either trigger to launch a "bomb" (or maybe I'm just forgetting and that's exactly how the DC version played. I have it downstairs, guess I could stop being lazy and jog my memory).
Anyway, it plays great once I got acclimated, the challenge is REALLY there (level design is very, very clever), and it's really fun. Looks great, too. Hell, I'm happy having spent $50 on it, so I'd easily, VERY EASILY recommend that you all mofos buy the NA version when it comes out, soon and all.