I bought a GG system and replaced all of the capacitors. The unit is in excellent cosmetic condition and the audio is perfect. However, the video, while greatly improved by the cap replacement, is not great. There is still some slight vertical banding, but it is not that noticeable if the contrast is tweaked. I don't have a good GG with which to compare, so I don't know if these are problems with the unit, or are just a manifestation of the characteristically poor LCDs that I hear people complain about.
I am looking to trade this for other systems, accessories, or games.