Yea, I have all the emulators on there. For the most part, all of the consoles and roms work. There are a few Nintendo roms that will mess up. The N64 console is a mess though. Only like half the games work and alot of them are very glitchy especially with the graphics.
Overall, you'll love it. It runs smooth and even better than before.
Its not that easy to add new games on this old original xbox. Since there's no USB support, it doesnt leave us with alot of easy options. The options that I do know of are to 1.) burn data to CD-R and copy to hd 2.) FTP in thru your computer
I was lucky enough to have it come loaded with alot of utility apps and games but then i wanted more so I dove into the internet forums and figured out how to install new utilities and emulators. If possible, just give a list of everything you want loaded on it from whoever ur buying it from. It will save you alot of time and energy. Plus, they more than likely will simply just have a disc that they copy it all over for you instead of you having to go and hunt down each and every one.
I have the following emulators: Neo Geo, nes, snes, sega master system, sega genesis, sega saturn, gameboy, nintendo 64, playstion 1(doesnt work that good), turbo grfx 16, Commodore 64.
I would say all consoles work well up to Nintendo 64 where it gets iffy. However, Mario Kart64 works and so does Zelda!