I tried to emulate Gamecube (games I already own in physical form, ya nosey dinguses). Pikmin ran alright-ish, but had crackly audio. Super Mario Sunshine's audio didn't want to work after the file-select dialogue.
anything past n64 never really works with romsfor me atleast
to simplify the process of recording console gameplay.
there's those rumors of windows 8 and 360 compatibility.