Also going back to the original discussion - how faithful are the MAME/Demul emulations compared to the 360 versions or, indeed, the original games ??
Espgaluda II, Futari, and the Japanese version of Deathsmiles are all Platinum Collection titles, so you should be able to get them pretty cheap anywhere. I think Aksys and Rising Star Games localized Deathsmiles as a budget title, as well.
We don't know how well demul and eventually MAME will emulate the CV1000 games. I think I read that the demul team is going for 90-95% slowdown accuracy, but I could be remembering wrong.
As for the 360 ports compared to the original PCBs:
Futari, Deathsmiles (arcade mode), Ketsui, Dai Fukkatsu, and DOJ Black Label are all missing some slowdown, but not nearly enough to actually detract from them. Some have their own little unique imperfections as well, like Ketsui running slightly faster than the PCB version. Espgaluda II has considerably less slowdown than the PCB, but not in many instances which actually detract from the game. Arika's ports of DOJ and Espgaluda are considered arcade-perfect by some.
Mushihimesama, Ibara, Deathsmiles II, Deathsmiles (Arcade 360, MBL, MBL 360), and Muchi Muchi Pork, are all messes when it comes to slowdown. Ibara is missing virtually all of it. Inaccurate slowdown in the others make it much more difficult to replicate scoring strategies that work in the PCB versions, such as boss milking in MMP. MMP also has misplaced enemies in stage 5. Mushihimesama and Ibara are also plagued by long loading times and blurry graphics.
The port of Pink Sweets is actually quite good, but the problem is that it's of a revision that literally nobody plays, which was a huge let-down. The biggest issue with this is that it lacks the infinite lives trick that the game is known for, making it impossible to actually compete with scores coming out of the PCB version that everyone plays. The game also lacks convenient rapid fire settings, which make rank control that much harder.
I haven't heard anything bad about Akai Katana Shin, probably thanks to CAVE hiring Hiroyuki Kimura to do Game Quality Control.
Overall, some games are lacking in video and filter options (like Dai Fukkatsu, I think) or replay saving (DS IIX). A few don't even let you enter your initials when saving a score, which is actually a point of contention for some people.