X-mods while harsh is pretty much correct in his statements.
If you just want to play the games you may want to go the CMVS or Super Gun/slot mobo route.
There are issues you will have with all of the converters and I feel like Dr.Neo should have did more tests before placing his Super Neo Converter on the market.
This is what I know now specific to the super mvs convereter(blue led) I owned.
There aere scaling issues in Fatal Fury Titles and Kizuna Encounter(just learned about Kizuna). Random Resetting of AES playing newer titles like MS5,MS4,MS3,SNKvs Capcom,KOF2003 while using an AES that outputs 5v 3A . There is no resetting while playing them in an AES that outputs 10V 1000ma(JPN AES) but the JPN AES will not play Metal SLug X so if you have a JPN system that outputs 10V 1000ma you can play all games with no problems with the exception of Metal Slug X.
In regards to the Super Power Supply:
http://www.ic2005.com/html/2005/show-46.htm
Make sure your converter is tested out thoroughly before it's sold to you if you purchase one.
BB