I've seen those.. I'm not sure about the quality of the SNES but the way these clone machines play NES games is HORRIBLE. Colors and sound are off, the video quality is just poor and some games don't work at all (and many work while acting a bit odd). Do a search for "NES on a chip" for more info.. if you were picking one up for a handful of games, it might be worth it.. otherwise you're much better off picking up the original hardware (at least in the case of the NES).
Twitter, Wii U and Xbox 360: PixyJunket