MAME, or anything that uses that file structure (i.e. MESS) is a motherfucking BITCH to get working sometimes. Tracking down good ROMs is a pain in the ass, configuring some to work is a pain in the ass, and finding the right extension files (CHD, BIOS, etc.) is a pain in the ass. I still have yet to get the old arcade Battletoads to get working on recent versions of MAME. Plus configuring controls for every little game, lest you want controls to be good on NEO-GEO games but bad on CPS games. If there's an arcade emulator that does it more conveniently than the MAMEUI line, please let me know.