I have my RS-69. Jumped on it for the low price point. The performance obviously varies between different emulators. Excellent support for NES, no complaints. GBA performs well at full speed. What arcade games are supported run smoothly. Genesis is functional and SNES performance is suspect to say the least. The only thing that really hampers GBA emulation is that the triggers are (inexplicably) not mapped. Very few arcade boards are supported. Only first generation Neo Geo and CPS1 as no arcade rom over 10mb will load. Genesis is stable with a little frame skipping in faster titles, buttons are mounted in the order C, A, B (less than ideal). SNES emulation is the worst with both frame skipping and sprite priority issues, also no triggers (obviously).