I only recommend MAMEUI only as it is easy to setup. Some of the features I like, personally, and that is what I use for MAME. First setup MAMEUI outside of GameEx. Then when your all straight, open up the Setup Wizard. You can setup MAMEUI with the Setup Wizard under the MAME settings. Just show GameEx where your .exe file is, artwork, roms and so on and that's it. Once you open GameEx, under the MAME selection, scroll down to the bottom option and "Update List". It takes some time but it will then show all your MAME games in the list.